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动词不定式

( 1)作主语

To learn a foreign language is not easy.

It is not easy to learn a foreign language.

( 2)作宾语

They began to read.

( 3)作宾语补足语

Jim asked me to help him with his lessons.

We often heard her sing.

( 4)作定语

I have an important meeting to attend.

( 5)作状语

She went to see her grandma yesterday.

( 6)用在how, when, where, what, which等之后

I don’t know how to use a computer.

Do you know when to start?

He didn’t know what to do next.

句子种类

(1)陈述句 ( 肯定式和否定式)

(2)疑问句 ( 一般疑问句、特殊疑问句、选择疑问句、反意疑问句)

(3)祈使句 ( 肯定式和否定式)

(4)感叹句

句子成份

1)主语

Betty likes her new bike.

He gets up early every day.

To learn a foreign language is not easy.

2)谓语

We work hard.

The boy caught a bird.

He is my brother.

They all look fine.

3)表语

Her sister is a nurse.

It’s me. I’m ready.

He got angry.

We were at home last night.

His cup is broken.

4)宾语

Tom bought a story-book.

I saw him yesterday.

He wanted to have a cup of tea.