<剑桥初级英语语法>含有be动词和情态动词的否定和疑问

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含有be动词和情态动词的否定与疑问

含有be动词和情态动词的否定式

直接在be动词或情态动词后面加not

I am→I am not→I’m not

He/she/it is→he/she/it is not→

he’s not或he isn’t

she’s not或she isn’t

it’s not或it isn’t

We/you/they are→we/you/they are not→

we aren’t或we’re not

you aren’t或you’re not

they aren’t或they’re not

例句：

Tom isn’t interested in politics.

Jane isn’t a teacher.

Those people aren’t English.

It is not hot today.

I’m not late.

can→can not或cannot

may→may not

must→must not→mustn’t

need→need not→needn’t

例句：

4. You needn′t telephone him now.

含有be动词和情态动词的疑问句

将be动词或情态动词移到主语前面

I am→am I?

He/she/it is→is he/she/it?

We/you/they are→are we/you/they?

例句：

Am I late?

Is your mother at home?

Are your parents at home?

Is it cold in your room?

He/she/it/I/you/we/they can→

can he/she/it/I/you/we/they?

He/she/it/I/you/we/they must→

must he/she/it/I/you/we/they?

例句：

Can you speak English?

Must I do this?

May I ask you a question?

Need I repeat this?