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ergy from the nucleus of the atom. There has bee too much rain in San Francisco this year. Up to the present everything has been successful. (4) 現(xiàn)在完成時(shí)與 for 引起的短語連用時(shí),表達(dá)從過去開始的動(dòng)作或狀態(tài)延續(xù)至今, 而一般過去時(shí)與“ for+一段時(shí)間”連用時(shí),只指過去的動(dòng)作或狀態(tài)在過去延續(xù)了多長時(shí)間。 We39。ve stayed here for three weeks. 我們在這里呆了三個(gè)星期了。(說話時(shí)人還在)。 He stayed here for three weeks last year. 他過去曾在這里呆過三個(gè)星期。(并不表示 現(xiàn)在是否在) (5) have gone to和 have been to的區(qū)別: 前者表示某人 “ 去某地了 ” ,這個(gè)人已經(jīng)不在這里了,常用于第三人稱。 后者表示某人 “ 去過某地,現(xiàn)在已經(jīng)回來了 ” , 常與 ever等連用 可用于各人稱: She has gone to England. 她到英國去了。 She has been to 。 “Where is Tom?”“He has gone to the post office.” ( Tom