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SOS紧急!不知道怎样conjugatepresentperfect跟pastperfectconjugatetheverbTOBEandHAVEinpresentperfectandpastperfect.

题目详情
SOS紧急!不知道怎样conjugate present perfect跟past perfect
conjugate the verb TO BE and HAVE in present perfect and past perfect.
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答案和解析
题目是:把动词be 和have变成现在完成时和过去完成时形式.
be 现在完成时形式是 have/has been,过去完成时形式是 had been
have …………是have/has had,………………是 had had