比如，列出你正在学的语法知识的全部形式，如现在完成时。
For example, try to write down each example of a form you are studying such as the present perfect.
用动词的正确形式将下面的句子变成现在完成时的被动语态。
Change these sentences into the present perfect passive putting the verbs into the correct forms.
用动词的正确形式将下面的句子变成现在完成时的被动语态。
Change these sentences into the Present Perfect Passive, putting the verbs into the correct forms.
用动词的正确形式将下面的句子变成现在完成时的被动语态。
Change these sentences into the Present Perfect Passive, putting the verbs into the correct forms.
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