今天小編為大家推送的是英語四六級，一起來看看吧！英語四六級語法（44）用一般過去時代替完成時分享。
1)兩個動作如按順序發(fā)生，又不強調(diào)先后，或用then，and，but 等連詞時，多用一般過去時。
When she saw the mouse，she screamed.
My aunt gave me a hat and I lost it.
2 ) 兩個動作相繼發(fā)生，可用一般過去時;如一個動作需要若干時間完成，用過去完成時。
When I heard the news, I was very excited.
3)敘述歷史事實，可不用過去完成時，而只用一般過去時。
Our teacher told us that Columbus discovered America in 1492.
將來完成時
1) 構(gòu)成will / be going to do sth.
2) 概念
a. 狀態(tài)完成：表示某事繼續(xù)到將來某一時為止一直有的狀態(tài)。
b. 動作完成：表示將來某一時或另一個將來的動作之前，已經(jīng)完成的動作或一獲得的經(jīng)驗。
They will have been married for 20 years by then.
You will have reached Shanghai by this time tomorrow.
一般過去時的用法
1)在確定的過去時間里所發(fā)生的動作或存在的狀態(tài)。
時間狀語有：yesterday, last week, an hour ago, the other day, in 1982等。
Where did you go just now?
2)表示在過去一段時間內(nèi)，經(jīng)常性或習(xí)慣性的動作。
When I was a child, I often played football in the street.
Whenever the Browns went during their visit, they were given a warm welcome.
3)句型：
It is time for sb. to do sth "到……時間了" "該……了"
It is time sb. did sth. "時間已遲了" "早該……了"
It is time for you to go to bed. 你該睡覺了。
It is time you went to bed.你早該睡覺了。
would (had) rather sb. did sth.表示'寧愿某人做某事'
I'd rather you came tomorrow.
4) wish, wonder, think, hope 等用過去時，作試探性的詢問、請求、建議等。
I thought you might have some. 我以為你想要一些。
比較：
一般過去時表示的動作或狀態(tài)都已成為過去，現(xiàn)已不復(fù)存在。
Christine was an invalid all her life.
(含義：她已不在人間。)
Christine has been an invalid all her life.
(含義：她現(xiàn)在還活著)
Mrs. Darby lived in Kentucky for seven years.
(含義：達(dá)比太太已不再住在肯塔基州。)
Mrs. Darby has lived in Kentucky for seven years.
( 含義：現(xiàn)在還住在肯塔基州，有可能指剛離去)
注意： 用過去時表示現(xiàn)在，表示委婉語氣。
1)動詞want, hope, wonder, think, intend 等。
Did you want anything else?
I wondered if you could help me.
2)情態(tài)動詞 could, would.
Could you lend me your bike?
