助动词do doesdid 和be动词am is are用法的区别

助动词do \ does \ did 和be动词am \ is \ are 用法的区别

助动词do \ does \ did

do是原形，用于一般现在时态中的第一二人称和第三人称的复数（I,you,we,they）；

does是do的第三人称单数形式，用于一般现在时态的第三人称单数（he,she,it，姓名）；did是do的过去式，用于一般过去时态的任何人称（I,you,he,she,it,we,they）。

不管怎样，跟在这三个词后面的动词都必须为动词原形。

do \ does \ did+ V.（动词原形）

例如：

Do you like meat\ bananas\fish\apples? No,I don`t.

Does he like apples? No,he doesn`t.

He does like apples. like就是原形

Where did he go yesterday? 他昨天哪儿了？

Did you study English? 你们学过英语吗？

系动词（be动词）am \ is \ are

be是系动词,又称be动词,包括am、is、are三个。

am用于第一人称单数；(I)

第三人称单数用is；(he\she\it)

其他人称全部都用are。(we \they\ you\ 、、、)

was （am \ is 的过去式） wasn’t

were（are 的过去式） weren’t

练习题：

______she like drinking? ________they play football?

______she beautiful? ________your dog walk in the zoo?

______she come from China? He ________ like pears.

______she from China? _______ your cats eat fish?

______ he watch TV at night? _______ you go to school everyday?

______ we have a good teacher? I ________ have a watch.

______you a student? , .（否定回答）

There ______ many boats on the lake. Children ______ happy yesterday.

Amy ______ hungry yesterday. ______ they young then?

______ he tall then? , .（否定回答）

______ it sunny? , .（否定回答）

______ it windy yesterday ______ Beijing? , .（否定回答）______ she ______ ______ zoo then? , .（否定回答）