Question

帮忙做一下这几道题，我不了解用什么语法，请指教！

Answer 1

1.have studied; 2.have lived; 3.have done;4. had played;5. have known;6.been waited;
7.been enjoying play;8. had gone ;9.had could't 10.had managed

追问

请问知识点是什么？

追答

过去完成时吧

Answer 2

have studied

追答

have lived. have done

has played. have known

been waiting

enjoyed playing

gone

couldn't

managed