Question

现在完成时的have什么时候用had？？

e.g：I had already do sth.这时候怎么用had？

Answer 1

have 是现在时。
had 是过去式或完成时。

例子：I have had my homework finished.

Answer 2

现在完成时不用had除非have had 要不然就是过去完成时