1)have +過去分詞，構成完成時態(tài)。例如：
He has left for London. 他已去了倫敦。
By the end of last month， they had finished half of their work. 上月未為止，他們已經完成工作的一半。
2)have + been +現在分詞，構成完成進行時。例如：
I have been studying English for ten years. 我一直在學英語，已達十年之久。
3)have +been +過去分詞，構成完成式被動語態(tài)。例如：
English has been taught in China for many years. 中國教英語已經多年。
He has left for London. 他已去了倫敦。
By the end of last month， they had finished half of their work. 上月未為止，他們已經完成工作的一半。
2)have + been +現在分詞，構成完成進行時。例如：
I have been studying English for ten years. 我一直在學英語，已達十年之久。
3)have +been +過去分詞，構成完成式被動語態(tài)。例如：
English has been taught in China for many years. 中國教英語已經多年。