7)紧跟在why或why not之后的动词不定式总是不带to。但是,紧跟在who,what,which,whether等连接词后的不定式带to。例如: Why stand up if you can sit down? Why not ask your teacher when you don't understand the meaning? You needn't decide yet whether to study arts or science. 4.不定式的完成式和进行式 1)构成 完成式:to+ have done 进行式:to+ be doing
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