be动词和助动词的区别和用法是什

1、be动词的用法。be am/is was 单数 are were 复数

英语中be动词选用单数还是复数，要由主语来定，主语是单数，就用单数，反之用复数。

句中含有be动词时: 肯定句: 主语+

be + 其他 否定句: 主语+ be + not + 其他一般疑问句: Be +主语+其他 +?

特殊疑问句:疑问词(what/who/when/ where)+ be +主语 + 其他 +?

如:

l am a teacher.

You are right.

She is 16 years old.

My father is at home.

The students are playing games.

My teacher was ill yesterday.

There is a picture on the wall.

There are two books on the table.

be动词用法歌:

我用am，你用are，is 连接他她它。单数名词用is，复数名词全用are。变疑问往前提，句末问号莫丢弃; 变否定，更容易，be后 not莫忘记; 疑问否定任你变，句首大写莫迟疑。

be动词作谓语，它后面一般跟名词、形

容词或介词短语。

2、助动词的用法。

英语句子按正常语序是“什么人或事物”+“做什么”，即，我们常说的“主语 +谓语 +其他”。

① 主语为| 或复数名词、代词时:

肯定句:I/We/They/The students +动词原形 + 其他 +。We watch TV every

night.变否定: 主语+ don't + 动词原形 + 其他 +。

We don't watch TV every night.

一般疑问句 Do +主语 +动词原形+其他+? Do you watch TV every night? Yes, we do./ No, we don't.

特殊疑问句:疑问词 +do +主语 +动词原形 +其他 +?

How often do you watch TV?

② 主语为单数名词或代词时:

肯定句: 主语 +动词第三人称单数形式+其他 +。He watches TV every night.

否定句:主语+ doesn't+动词原形+其他+。

He doesn't watch TV every night.一般疑问句:Does+主语+动词原形+其他 +?

Does he watch TV every night? Yes, he does./ No he doesn't.

特殊疑问句:疑问词 +does +主语+动词原形+其他 +?

How often does he watch TV?

③ 过去时的句式(当句子时态为过去时时，动词用过去式，不受主语单复数的影

响，主语+过去式+具他+。

He / We got up early every morning last year.否定句: 主语+didn't+动词原形+其他+……

He / We didn't get up early every morning last year.

一般疑问句: Did+主语+动词原形+其他 +?

Did he / you get up early every morning last year? Yes, he / we did./ No, he / we didn't.