8th Grade English: Let's Master Infinitives!
Hello, everyone! Today, we’re going to study something very important in 8th-grade English: the "infinitive."
The name "infinitive" might sound a bit intimidating at first. But don't worry—the logic is actually quite simple! It’s a magical rule where you just use the form "to + base form of a verb," and it suddenly expands what you can say in English in a big way.
It might feel tricky at first, but if you take it one step at a time, you'll definitely get it. Let’s do our best together!
1. The Basic Form of the Infinitive
First, let’s look at what the infinitive "looks like." The rule is just this!
【Form】 to + base form of a verb
The "base form" is the original version of the word as you’d find it in a dictionary—no "-s," no "-ing," and no past tense endings.
For example, to play, to eat, and to go are all infinitives.
Pro-tip:
You can never have playing or played after the to in an infinitive! Always use the original form, like play.
Common Mistakes:
× to playing
× to plays
○ to play
2. The Three "Faces" of the Infinitive
Infinitives have three main ways of being used. Think of it like one person wearing three different hats: a "student," a "sports team captain," and a "son at home."
① Noun Usage (～ing / to do)
This is when you turn a verb into a noun that means "doing something."
Example: I like to play soccer.
(I like playing soccer.)
Originally, play is a verb meaning "do," but by adding to, it transforms into a noun phrase. It can also act as the subject of a sentence.
Example: To study English is fun.
(Studying English is fun.)
Summary: If you can translate it as "doing something," it's a noun usage!
② Adverbial Usage (in order to ～)
This usage expresses a purpose—the "why" behind an action. We translate it as "in order to ~" or "to ~."
Example: I went to the library to study.
(I went to the library to study.)
Another adverbial usage is to express the reason for an emotion (e.g., "to be...").
Example: I am happy to see you.
(I am happy to see you.)
Fun Fact:
Remember to use to whenever you want to explain "why you went somewhere" or "why you feel a certain way!"
Summary: Translate adverbial usages as "to ~" or "because I am ~ (e.g., happy to see you)."
③ Adjective Usage (for ～ing / to ～)
This is used to describe a noun by coming after it. Translate it as "something to ~" or "something for ~ing."
Example: I want something to drink.
(I want something to drink.)
Example: I have a lot of homework to do.
(I have a lot of homework to do.)
Point:
In this usage, the order is always "noun + to + base verb." Phrases like something to eat are very common, so try learning them as a set!
Summary: Adjective usage follows the "noun + to" pattern; translate it as "to ~."
3. Tips for Identifying Infinitives
If you're ever stuck and can't tell which usage it is, try thinking through these steps:
Step 1: Look at the word right before it.
- If it's after a verb like like or want? → Noun usage (doing something)
- If it's after a noun like something or book? → Adjective usage (to ~)
- If you read to the end of the sentence and it's describing a "purpose"? → Adverbial usage (in order to ~)
Study Tip:
The Japanese word for "infinitive" (不定詞) means "not fixed." This means its role changes depending on where it's placed. Checking its position in the sentence is the fastest shortcut to mastering it!
4. Summary: Just Remember This!
1. The form is to + base verb.
2. There are three main ways to translate it:
・"doing something" (Noun usage)
・"to ~" or "in order to ~" (Adverbial usage)
・"to ~" (Adjective usage)
3. After words expressing emotion, translate it as "to ~" (e.g., happy to see you).
How was that? The infinitive is a very handy tool that makes your English sentences much richer. Read and write the examples many times to get used to it bit by bit. You’ve already taken the first step toward mastering the basics of infinitives! I’m cheering for you!