Modal verbs, impersonal verbs and interesar-type verbs

Q: How does the meaning of the verb saber change when followed by an infinitive?

When followed by an infinitive, saber means "to know how to do something" (expressing a learned skill or ability).

Q: How is the stem-changing verb soler used to describe habits in Spanish?

Soler ( $o \rightarrow ue $) is conjugated in the present tense and followed directly by an infinitive to mean "to usually do something".

Q: What is the difference between hay que + infinitive and tener que + infinitive?

Hay que expresses an impersonal, general obligation ("one must"), whereas tener que is conjugated for a specific person ("I have to / you have to").

Q: When should an interesar -type verb take the plural form instead of the singular form?

Use the plural form (ending in -n , like interesan or gustan ) when the grammatical subject that follows is a plural noun.

Spanish (2024) (1SP1) · Pearson Edexcel GCSE (9-1) · 9 min read · Updated: 27 Aug 2026

Welcome to one of the most powerful grammar toolkits in GCSE Spanish! Whether you are aiming for a Grade 4 or a Grade 9, mastering these three verb structures will instantly boost your range and accuracy across Speaking, Listening, Reading, and Writing.

Don't worry if these seem tricky at first. In English, we say things like "I like pizza", but in Spanish, the sentence flips to mean "Pizza is pleasing to me". Once you understand the simple patterns below, you will be able to express opinions, obligations, and habits with confidence.

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Modal verbs are verbs that help another verb. They express ability (can), obligation (must), desire (want), knowledge of how to do something (know how), or habits (usually do).

The Golden Rule of Modal Verbs

In Spanish, a modal verb is conjugated and followed directly by an infinitive (the unchanged verb ending in -ar, -er, or -ir).
Formula: $ \text{Conjugated Modal Verb} + \text{Infinitive} $
Crucial rule: Do not put a, de, or que between the modal verb and the infinitive!

1. Poder (To be able to / Can)

Poder is an $o \rightarrow ue$ stem-changing verb in the present tense:
• puedo (I can)
• puedes (you can)
• puede (he/she/it can, you formal can)
• podemos (we can)
• podéis (you all can)
• pueden (they can)
Example: Puedo hablar español. (I can speak Spanish.)
Polite Conditional Form: Use podría (could) for polite questions: ¿Podría ayudarme? (Could you help me?)

2. Deber (Must / To have to / Ought to)

Deber is a regular -er verb:
• debo, debes, debe, debemos, debéis, deben
Example: Debo estudiar más. (I must study more.)
Conditional Form: Debería means should / ought to: Deberías comer más fruta. (You should eat more fruit.)

3. Querer (To want)

Querer is an $e \rightarrow ie$ stem-changing verb:
• quiero, quieres, quiere, queremos, queréis, quieren
Example: Quiero viajar a España. (I want to travel to Spain.)
Polite Formula: Use quisiera (I would like) + infinitive for polite requests in restaurant role-plays: Quisiera reservar una mesa.

4. Saber (To know how to)

When saber is followed by an infinitive, it means to know how to do something. Notice the irregular first person (sé):
• sé, sabes, sabe, sabemos, sabéis, saben
Example: Sé nadar muy bien. (I know how to swim / I can swim very well.)

5. Soler (To usually do / To be accustomed to)

Soler is an $o \rightarrow ue$ stem-changing verb used to talk about regular habits:
• suelo, sueles, suele, solemos, soléis, suelen
Example: Suelo levantarme temprano. (I usually get up early.)

Key Takeaway: Modal Verbs

Conjugate the first verb to match the person, then drop the second verb in as an unchanged infinitive: Quiero (conjugated) + comer (infinitive).

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Part 2: Impersonal Verbs and Expressions

Impersonal verbs are verbs that do not have a specific person (like yo or tú) doing the action. In Spanish, they are always conjugated in the third-person singular (the él / ella / usted form).

1. The "Haber" Family: Hay (There is / There are)

The verb haber gives us the super-useful word hay. Remember: hay means both there is AND there are. It never takes an 's'!
• Present: hay (there is / there are)
• Preterite: hubo (there was / there were - completed event)
• Imperfect: había (there was / there were / there used to be)
• Future: habrá (there will be)
• Conditional: habría (there would be)

2. General Obligation: Hay que + Infinitive

When you want to say "one must" or "it is necessary to" without pointing at a specific person, use hay que + infinitive.
Example: Hay que reciclar el plástico. (One must recycle plastic / It is necessary to recycle plastic.)

3. The Impersonal "Se" (One can / You can / One must)

Using se before a third-person verb creates general rules and statements:
• Se puede + infinitive (One can / You can): Se puede ir en autobús.
• Se necesita + infinitive / noun (One needs / You need): Se necesita trabajar duro.
• Se debe + infinitive (One must): Se debe proteger el medio ambiente.

4. Essential Fixed Impersonal Expressions

These fixed phrases add high-level sophistication to your essays and speaking answers:
• Hace falta + infinitive / noun (It is necessary / It is needed): Hace falta estudiar. / Hace falta tiempo.
• Vale la pena + infinitive (It is worth / worthwhile): Vale la pena visitar el museo.
• Parece (It seems): Parece fácil. / Me parece bien.
• Basta / Basta con + infinitive (It is enough / Sufficient): Basta con decir la verdad.
• Falta (It is missing / lacking): Falta un lápiz.

5. Impersonal Weather Expressions

Weather in Spanish frequently uses impersonal hacer in the 3rd person singular:
• Hace frío (It is cold)
• Hace calor (It is hot)
• Hace sol (It is sunny)
• Hace viento (It is windy)
• Hace buen / mal tiempo (The weather is good / bad)
Other specific weather verbs stay in the 3rd person singular:
• Llueve (from llover - it rains / it is raining)
• Nieva (from nevar - it snows / it is snowing)

Key Takeaway: Impersonal Expressions

Impersonal expressions always stay in the singular 3rd-person form. They never change for "I", "you", or "we".

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Part 3: Interesar-Type Verbs

These verbs express opinions, reactions, likes, and dislikes. In English, we say "I am interested in science". In Spanish, the structure works backwards: "To me, science is interesting."

The Anatomy of an Interesar Sentence

The person experiencing the feeling is NOT the grammatical subject. They are the indirect object. The grammatical subject is the thing or activity that causes the feeling!

The Master Formula:
$ (\text{Optional Clarification}) + \text{Indirect Object Pronoun} + \text{Verb (Singular or Plural)} + \text{The Thing/Activity} $

Step 1: Choose the Indirect Object Pronoun (Who is feeling it?)

• me (to me)
• te (to you [informal singular])
• le (to him / her / you [formal])
• nos (to us)
• os (to you all [informal plural])
• les (to them / you all [formal])

Step 2: Choose the Verb Form (Singular vs Plural)

You almost always need only TWO forms of the verb in the present tense: the 3rd person singular (ends in -a / -e) or the 3rd person plural (ends in -an / -en).

Use the SINGULAR verb form when followed by:
1. A singular noun: Me interesa la historia. (History interests me / I am interested in history.)
2. An infinitive verb (or multiple infinitives): Nos gusta leer y escribir. (Reading and writing please us.)

Use the PLURAL verb form when followed by:
1. A plural noun: Les interesan las ciencias. (Sciences interest them / They are interested in science.)

Step 3: Key Verbs in this Group for GCSE

• interesar: me interesa(n) (to interest)
• gustar: me gusta(n) (to like / to please)
• encantar: me encanta(n) (to love / to delight)
• chiflar / molar / fascinar / apasionar: me chifla(n) / me mola(n) / me fascina(n) / me apasiona(n) (to love / to be crazy about / to fascinate)
• molestar / fastidiar: me molesta(n) / me fastidia(n) (to annoy / bother)
• aburrir: me aburre(n) (to bore)
• dar igual / dar lo mismo: me da igual / me da lo mismo (to not matter / to be all the same to someone)
• parecer: me parece(n) (to seem to someone: ¿Qué te parece? = What do you think?)

Adding Emphasis or Clarification with "A"

Because le can mean to him, to her, or to you (formal), we often put a + name/pronoun at the start for clarity or emphasis:
• A Juan le interesa el arte. (Juan is interested in art.)
• A mí me gusta la música. (As for me, I like music.)
• A mis amigos les aburren las matemáticas. (My friends are bored by maths.)

Key Takeaway: Interesar-Type Verbs

The verb must agree with the thing you like/dislike, NOT with you! If the thing is plural, add an -n (me gustan los deportes). If it's a singular noun or an infinitive, keep it singular (me gusta el fútbol / me gusta jugar).

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Part 4: Top 5 Examiner Traps to Avoid

1. Writing "Yo gusto" or "Yo intereso"

The Error: Translating word-for-word from English: "Yo gusto la pizza" or "Yo intereso las ciencias".
The Fix: Always use the indirect pronoun + 3rd person verb: Me gusta la pizza / Me interesan las ciencias.

2. Adding Unnecessary Prepositions After Modal Verbs

The Error: Writing "Quiero a comer", "Debo de estudiar", or "Puedo para ir".
The Fix: Modal verbs (querer, poder, deber, saber, soler) connect straight to the bare infinitive: Quiero comer, Debo estudiar, Puedo ir.

3. Pluralising "Hay"

The Error: Writing "Habían muchas personas" or "Hayn problemas".
The Fix: When expressing existence (there is / there are / there were), haber is strictly impersonal and singular in standard Spanish: Había muchas personas, Hay problemas.

4. Confusing "Hay que" with "Tener que"

The Error: Mixing up general obligations with personal ones.
The Fix:
• Hay que + infinitive = General / Impersonal ("One must / It is necessary" $\rightarrow$ Hay que hacer los deberes).
• Tener que + infinitive = Personal obligation with a specific subject ("I have to / You have to" $\rightarrow$ Tengo que hacer mis deberes).

5. Dropping "Le / Les" When a Person is Named

The Error: Writing "A mi madre gusta el té".
The Fix: In Spanish, even when you state the person's name with a, you must keep the indirect object pronoun (le/les): "A mi madre le gusta el té."

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Quick Reference Summary Table

Structure: Modal Verb + Infinitive
Pattern: Conjugated Modal + Infinitive
Top Example: Debo estudiar (I must study) / Suelo salir (I usually go out)

Structure: Impersonal Verb
Pattern: 3rd Person Singular Form Only
Top Example: Hay que reciclar (One must recycle) / Vale la pena (It is worth it)

Structure: Interesar / Gustar Verb
Pattern: Pronoun (me/te/le/nos/os/les) + Verb (3rd sing./pl.) + Subject
Top Example: Me chifla la música (Singular) / Me encantan los libros (Plural)

Quick check

Can you answer these now?

Open each question to check the key ideas from this chapter.

What is the general grammatical rule for constructing sentences with modal verbs in Spanish?

Conjugate the modal verb and follow it directly with an infinitive, without adding prepositions like a, de, or que in between.

How does the meaning of the verb saber change when followed by an infinitive?

When followed by an infinitive, saber means "to know how to do something" (expressing a learned skill or ability).

How is the stem-changing verb soler used to describe habits in Spanish?

Soler ($o \rightarrow ue $) is conjugated in the present tense and followed directly by an infinitive to mean "to usually do something".

What are impersonal verbs and in which grammatical person are they conjugated?

Impersonal verbs do not have a specific grammatical subject (like yo or tú) and are always conjugated in the third-person singular (él / ella / usted form).

What is the difference between hay que + infinitive and tener que + infinitive?

Hay que expresses an impersonal, general obligation ("one must"), whereas tener que is conjugated for a specific person ("I have to / you have to").

How do interesar-type verbs function grammatically compared to standard English verbs?

The grammatical subject is the thing causing the feeling, while the person feeling it is represented by an indirect object pronoun (me, te, le, nos, os, les).

When should an interesar-type verb take the plural form instead of the singular form?

Use the plural form (ending in -n, like interesan or gustan) when the grammatical subject that follows is a plural noun.

Why is the indirect object pronoun (le or les) still necessary when a person is explicitly named in an interesar-type sentence?

Spanish grammar requires the redundant indirect object pronoun (le or les) even when the phrase a + [name/person] is explicitly stated for clarification or emphasis.

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Mastering Modal Verbs, Impersonal Verbs, and Interesar-Type Verbs

Part 1: Modal Verbs (The Helper Verbs)