He can't have been ill是现在完成时?
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He can't have been ill是现在完成时?
是现在完成时?
那可以不可以He have can't been ill?
还是必须放前面?
是猜测晓得了额,CAN'T BE..
但是不是现在完成时吗,为什么不是HAVE放前面呢?
是现在完成时?
那可以不可以He have can't been ill?
还是必须放前面?
是猜测晓得了额,CAN'T BE..
但是不是现在完成时吗,为什么不是HAVE放前面呢?
can't have done .用于表示对过去发生的事进行猜测,不可以He have can't been ill?
首先你应该知道什么是现在完成时 have done.can是情态动词,情态动词+完成时和完成时本身的意义是不一样的.have后面可以加副词但不能加情态动词.
首先你应该知道什么是现在完成时 have done.can是情态动词,情态动词+完成时和完成时本身的意义是不一样的.have后面可以加副词但不能加情态动词.
He can't have been ill是现在完成时?
He can't have been ill.
They can't have been doing thier homework.have been 是现在完成时,但
must have been和can't have been和现在完成时有没有联系啊
He must have been ill,___ he?
can't have been,must have been 结构里是不是不要把have been当现在完成时看,就把它
he can't have been Danish.he must have been Swedish.
He can't have been.He must have been.不是说单三用has吗?
he can't haue been a dcntist.he must have been a doctor.
关于现在完成时have been
现在完成时的have been
can't have been和must have been