助动词dodoesdid和be动词amisare用法的区别.doc

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 bananasfishapples? No,I dont.Does he like apples? No,he doesnt.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 arebe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；(hesheit)其他人称全部都用are。(we they you 、)was （am is 的过去式） wasntwere（are 的过去式） werent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）