To-infinitives：练习题

Fill in the blank with the correct form:
Students are encouraged ______ different language features in their writing.

Identify the sentence where the to-infinitive follows an adjective to express a result or a feeling.

Which of the following uses a to-infinitive as the real subject of a sentence introduced by the preparatory 'it'?

Based on the guidelines for 'Effective Speaking Skills', choose the correct structure to complete the sentence:

It is important for students _______ words and expressions appropriate to the context.

Which of the following sentences correctly uses the to-infinitive after an adjective to express a requirement in the writing process?

Based on the curriculum notes for ‘Effective Speaking Skills’, fill in the blank with the correct form of the verb (use) to express a requirement for students:

At the junior secondary level, students need to learn _______ words and expressions appropriate to the context.

Combine these two short sentences into one sentence using a to-infinitive:
I am going to the supermarket. I want to buy some milk.

Combine the following information into a single sentence using a to-infinitive as a subject and a modal verb to express necessity:
"Students evaluate their own speaking performance. This is a vital step for them. They must do it to become self-directed learners."

Read the following text describing different roles and goals in English language teaching at the junior secondary level. Complete the sentence below using the correct to-infinitive form of the verbs provided in the brackets.

Teachers play many roles in the writing classroom. They act as motivators (1) _______ (encourage) students to take risks, and as resource persons (2) _______ (provide) support. One major goal of teachers is (3) _______ (help) students develop better listening habits. To achieve this, students need (4) _______ (learn) how to identify key ideas in a passage.

Read the following sentence and explain the syntactic function of the to-infinitive phrase:

"Students need a quiet environment to concentrate effectively on their reading."

State whether the to-infinitive acts as a noun, adjective, or adverb, and explain what it expresses in this context.