2015年職稱英語考試語法：時(shí)態(tài)
1)現(xiàn)在完成進(jìn)行時(shí)態(tài) (have/has been + -ing 分詞構(gòu)成): 動(dòng)作或狀態(tài)從過去某時(shí)開始,繼續(xù)到現(xiàn)在,可能繼續(xù)下去,也可能剛剛結(jié)束.
I've been writing letters for an hour.
I've been sitting in the garden.
2)過去完成進(jìn)行時(shí)(由had been + ing分詞構(gòu)成): 過去某個(gè)時(shí)刻以前一直在進(jìn)行的動(dòng)作
I'd been working for some time when he called.
We had been waiting for her for two hours by the time she came.
3)將來完成進(jìn)行時(shí): 將來某個(gè)時(shí)刻以前一直在進(jìn)行的動(dòng)作.
By next summer, he will have been working here for twenty years.
In another month's time she'll have been studying here for three years.
4)將來完成時(shí)(由shall/will have + 過去分詞構(gòu)成): 將來某時(shí)已發(fā)生的事.
I shall have finished this one before lunch.
They'll have hit the year's target by the end of October.
