1）have +過去分詞，構(gòu)成完成時(shí)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(jīng)完成工作的一半。
2）have + been +現(xiàn)在分詞，構(gòu)成完成進(jìn)行時(shí)。例如：
I have been studying English for ten years. 我一直在學(xué)英語，已達(dá)十年之久。
3）have +been +過去分詞，構(gòu)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(jīng)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(jīng)完成工作的一半。
2）have + been +現(xiàn)在分詞，構(gòu)成完成進(jìn)行時(shí)。例如：
I have been studying English for ten years. 我一直在學(xué)英語，已達(dá)十年之久。
3）have +been +過去分詞，構(gòu)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(jīng)多年。