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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)在完成時與 for 引起的短語連用時,表達從過去開始的動作或狀態(tài)延續(xù)至今, 而一般過去時與“ for+一段時間”連用時,只指過去的動作或狀態(tài)在過去延續(xù)了多長時間。 We39。ve stayed here for three weeks. 我們在這里呆了三個星期了。(說話時人還在)。 He stayed here for three weeks last year. 他過去曾在這里呆過三個星期。(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