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例如: She had lived in the north for five years before she came here. :助動詞 +過去分詞 : 1) By the end of last term ,we ________( learn) 2020 words. 2) When I got home , my mother ___________(go) to bed . 3)He told me he __________( meet) her before . 4)He _________(leave ) his office when I arrived there . 5)She ________(visit) the city three times before she died in 1997. 。它表示動作發(fā)生的時間是“過去的過去”。如: She has taught English for twenty years . You have been in this school for ten years . 2一些瞬間動詞的現(xiàn)在完成時不能和表示一段時間狀語連用 . e go leave arrive leave borrow buy 不能與 for 或 since 連用 3提示詞: yet for just before / since once never/ twice ever already / in the last/past five years so far 4 has(have) been to / has(have) gone to在意義上的區(qū)別。如: I have just post a letter . 2)表示過去已經(jīng)開始,持續(xù)到現(xiàn)在(也許還會繼續(xù)下去)的動作或狀態(tài)。如: He was watching TV at eight last night . 2)表示過去某一階段正在進行的動作 . She was reading a novel yesterday morning . : When she the teacher came in / left / arrived / went out / got home , at nine yesterday : was /were +ving 1) He __________(do) his homework at two o’clock yesterday afternoon. 2)They__________(have) a meeting from 8 to 10 last night. 3)Mary__________(wash) her clothes when we came in. 4)At that time the boy