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助动词do\does\did和be动词am\is\are用法的区别助动词do\does\diddo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：Doyoulikemeat\bananas\fish\apples?No,Idon`t.Doeshelikeapples?No,hedoesn`t.Hedoeslikeapples.like就是原形Wheredidhegoyesterday?他昨天哪儿了？DidyoustudyEnglish?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；(he\she\it)其他人称全部都用are。(we\they\you\、、、)was（am\is的过去式）wasn’twere（are的过去式）weren’t练习题：______shelikedrinking?________theyplayfootball?______shebeautiful?________yourdogwalkinthezoo?______shecomefromChina?He________likepears.______shefromChina?_______yourcatseatfish?______hewatchTVatnight?_______yougotoschooleveryday?______wehaveagoodteacher?I________haveawatch.______youastudent?,.（否定回答）There______manyboatsonthelake.Children______happyyesterday.Amy______hungryyesterday.______theyyoungthen?______hetallthen?,.（否定回答）______itsunny?,.（否定回答）______itwindyyesterday______Beijing?,.（否定回答）______she____________zoothen?,.（否定回答）