英语四六级语法分享 四六级报名

　　今天小编为大家推送的是英语四六级，一起来看看吧！英语四六级语法（44）用一般过去时代替完成时分享。
　　1)两个动作如按顺序发生，又不强调先后，或用then，and，but 等连词时，多用一般过去时。
　　When she saw the mouse，she screamed.
　　My aunt gave me a hat and I lost it.
　　2 ) 两个动作相继发生，可用一般过去时;如一个动作需要若干时间完成，用过去完成时。
　　When I heard the news, I was very excited.
　　3)叙述历史事实，可不用过去完成时，而只用一般过去时。
　　Our teacher told us that Columbus discovered America in 1492.
　　将来完成时
　　1) 构成will / be going to do sth.
　　2) 概念
　　a. 状态完成：表示某事继续到将来某一时为止一直有的状态。
　　b. 动作完成：表示将来某一时或另一个将来的动作之前，已经完成的动作或一获得的经验。
　　They will have been married for 20 years by then.
　　You will have reached Shanghai by this time tomorrow.

　　一般过去时的用法
　　1)在确定的过去时间里所发生的动作或存在的状态。
　　时间状语有：yesterday, last week, an hour ago, the other day, in 1982等。
　　Where did you go just now?
　　2)表示在过去一段时间内，经常性或习惯性的动作。
　　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……时间了" "该……了"
　　It is time sb. did sth. "时间已迟了" "早该……了"
　　It is time for you to go to bed. 你该睡觉了。
　　It is time you went to bed.你早该睡觉了。
　　would (had) rather sb. did sth.表示'宁愿某人做某事'
　　I'd rather you came tomorrow.
　　4) wish, wonder, think, hope 等用过去时，作试探性的询问、请求、建议等。
　　I thought you might have some. 我以为你想要一些。
　　比较：
　　一般过去时表示的动作或状态都已成为过去，现已不复存在。
　　Christine was an invalid all her life.
　　(含义：她已不在人间。)
　　Christine has been an invalid all her life.
　　(含义：她现在还活着)
　　Mrs. Darby lived in Kentucky for seven years.
　　(含义：达比太太已不再住在肯塔基州。)
　　Mrs. Darby has lived in Kentucky for seven years.
　　( 含义：现在还住在肯塔基州，有可能指刚离去)
　　注意： 用过去时表示现在，表示委婉语气。
　　1)动词want, hope, wonder, think, intend 等。
　　Did you want anything else?
　　I wondered if you could help me.
　　2)情态动词 could, would.
　　Could you lend me your bike?