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英語六級語法知識：一般現(xiàn)在時代替將來時
時間狀語從句，條件句中，從句用一般現(xiàn)在時代替將來時
When, while, before, after, till, once, as soon as, so long as, by the time, if, in case (that), unless, even if, whether, the moment, the minute, the day, the year, immediately
He is going to visit her aunt the day he arrives in Beijing. 他一到北京，就去看他姨媽。
典型例題
(1)He said he________me a present unless I_______ in doing the experiment.
A. had not given; had not succeeded B. would not give; succeed
C. will not give; succeed D. would not give; will succeed.
答案B. 在時間，條件或讓步主語從句中一般不用將來時。本題有He said，故為過去式。主句用將來時，故選B. 此處用一般過去式代替了過去將來時。
(2) 表示現(xiàn)在已安排好的未來事項，行程等活動。
The museum opens at ten tomorrow. 博物館明天10點開門。(實際上每天如此。)
英語六級語法知識：一般現(xiàn)在時代替完成時
1) 有些動詞用一般現(xiàn)在時代替完成時：
hear, tell, learn, write , understand, forget, know, find , say, remember.
I hear (= have heard) he will go to London.
I forget (=have forgotten) how old he is.
2) 句型 " It is … since…"代替"It has been … since …"
3) It is (= has been) five years since we last met.
英語六級語法知識：過去完成時
1) 概念：表示過去的過去
----|-------|-----|---->其構(gòu)成是had +過去分詞構(gòu)成。
那時以前 那時 現(xiàn)在
2) 用法
a. 在told, said, knew, heard, thought等動詞后的賓語從句。
She said (that) she had never been to Paris.
b. 狀語從句
在過去不同時間發(fā)生的兩個動作中，發(fā)生在先，用過去完成時;發(fā)生在后，用一般過去時。
When the police arrived, the thieves had run away.
c. 表示意向的動詞，如hope, wish, expect, think, intend, mean, suppose等，用過去完成時表示"原本…，未能…"
We had hoped that you would come, but you didn't.
3) 過去完成時的時間狀語before, by, until , when, after, once, as soon as。
He said that he had learned some English before.
By the time he was twelve, Edison had began to make a living by himself.
Tom was disappointed that most of the guests had left when he arrived at the party.
典型例題
The students ___ busily when Miss Brown went to get a book she ___ in the office.
A. had written, left B，were writing, has left C. had written, had left D. were writing, had left
答案D. "把書忘在辦公室"發(fā)生在"去取書"這一過去的動作之前，因此"忘了書"這一動作發(fā)生在過去的過去，用過去完成時。句中when表示的是時間的一點，表示在"同學們正忙于……"這一背景下，when所引導的動作發(fā)生。因此
前一句應用過去進行時。
注意： had no … when 還沒等…… 就……
had no sooner… than 剛…… 就……
He had no sooner bought the car than he sold it.