大學(xué)英語四級語法精要 大學(xué)英語四級語法精要

大學(xué)英語四級語法精要

Ⅰ動詞(時態(tài),語態(tài),用法,省略,一致性等)

1.   時態(tài)

1)現(xiàn)在完成進(jìn)行時態(tài) (have/has been + -ing 分詞構(gòu)成): 動作或狀態(tài)從過去某時開始,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(由had been + ing分詞構(gòu)成): 過去某個時刻以前一直在進(jìn)行的動作

I’d been working for some time when he called.

We had been waiting for her for two hours by the time she came.