1、過去完成時(shí)(Past Perfect)。
描述一個(gè)行為在過去發(fā)生也在過去結(jié)束?!綡ad+過去分詞 Participle】
Until Mary studied abroad, she had never left the US.
After I had gone to the movies, I met up with my friends for coffee.
2、現(xiàn)在完成時(shí)(Present Perfect)
描述一個(gè)行為在過去發(fā)生并且直到現(xiàn)在?!綡ave+過去分詞 Participle】
I have lived in New York for 10 years.
She has been a fan of Broadway musicals since she was a child.
3、未來完成時(shí)(Future Perfect)
描述一個(gè)行為將在未來被完成。【W(wǎng)ill have +過去分詞 Participle】
I will have finished my thesis by August.
4、過去分詞 Participle
主要用在完成時(shí)態(tài)中(過去,現(xiàn)在,未來)
I have found/ seen many people.