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You can watch TV after you read a book.这句话为什么read不用变成ing形式?介

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You can watch TV after you read a book.这句话为什么read不用变成ing形式?介词后不应该动词加ing吗?
是不是因为can后动词变原型,可前面已经有动词了啊,后面的read是怎么回事?
You can watch TV after you read a book.这句话为什么read不用变成ing形式?介
因为read前面已经有了主语you,所以用动词原形
如果没有主语you,则是：reading,完整句子如下：
You can watch TV after reading a book.

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再问： 这里有了主语后动词应该看主语而变化吗？
再答： 是的，但是你所指的应该是人称的变化吧，比如第三人称单数？
再问： I play the piano then I play chess.也是这个道理吗？
You must read a book before your watch TV .祈使句. you must read a book befor you watch tv 改成祈使句 You can watch TV after supper 变成祈使句 改成现在进行时Does she read a book? Do you watch TV? I don't make a l must read a book before l can watch tv 的翻译 i can watch tv for half an hour b( ) i read a book 首字母填空 连词成句 read,before,can,I,watch,TV,I,a,must,book Because you like ,you can watch TV or read books .中那个错了并改正 He read a book and watch TV.存在什么语法错误 Can you finish____the book today?Sorry,I can't.A.read B.read You can watch TV () read some books.括号里填and还是or I have ____ this book.You can take it away.A.to read.B.read.