Todo infinitive usage summary primary school

Usage of to do infinitive: When the to do infinitive is used as the subject, it is generally used as the formal subject, and the infinitive is postposed; when the to do infinitive is used as the object, the specific sentence pattern is predicate verb + Verb infinitive and verb infinitive of the series structure; when to do infinitive is used as object complement, the specific structure is subject plus predicate plus object plus verb infinitive. Extended information

1. When the to do infinitive is used as the subject

1. Generally, it is used as the formal subject, and the infinitive is placed after it. Specific sentence patterns It's adj/noun (for sb) to do.

For example: It's a pity for you to drop out of school.

What a pity, you dropped out of school.

　It's a good idea for you to eat less fried food

　It's a good idea for you to eat less fried food.

2. When the to do infinitive is used as the object

1. Predicate verb + verb infinitive (most verbs belong to this type of verb)

For example: Some students hate to study English.

Some students don’t like to study English.

He pretended to be a good man.

He pretended to be a good man.

2. Column structure Verb infinitive

For example: I am glad to see him.

I am glad to see him.

His health is likely to get worse.

His health is likely to get worse.

3. When the to do infinitive is used as an object complement

1. The specific structure is: subject + predicate + object + verb infinitive

For example: The The teacher urged his students to prepare for the exam.

The teacher urged his students to prepare for the exam.

They help enabled me to finish the work with ease.

They help enabled me to finish the work with ease.

2. When the infinitive of a verb is used as a complement to the object of a verb such as make, have, let, hear, see, feel, etc., "to" should be omitted

For example: My father will probably have Tom paint the house green.

My dad probably asked Tom to paint the house green.

I felt my heart beat violently.

I felt my heart beat violently.

IV. When the to do infinitive is used as an adverbial of purpose

1. The specific structure is: in order/so as verb infinitive

For example: He must work very hard in order to support his large family.

　He must work hard in order to support his large family.

Listen carefully so as to follow the teacher.

Listen carefully so as to follow the teacher.

Listen carefully so as to follow the teacher.

2. The specific structure is: be used verb infinitive

For example: The book is used as a reference book.

This book is used to make reference book.