1. 与现在的事实相反:[If --- + were/did---, --- + would do---]</p> If I were you , I would marry him.
+ c4 c4 c: {$ J8 Z* X+ B6 g. B 如果我是你,就会嫁给他。& ?1 o# {1 c- t- S( D. G/ f
2. 与过去的事实相反:[If --- + had done---, --- +would have done---]6 L# w( f# h. S( S
If you had worked hard , you would have passed the exam.
3 w* t0 l9 @ E0 b! P9 R' w 如果你用功学习,就会通过考试了。
! \, n2 p- P( X 3. 与将来的事实可能相反:[If ---+ should do---, ---+ would do---]
% a* Q4 ?% Q, `, G If it should rain tomorrow , what would you do ?
( I7 O7 p8 C; L% K# } 如果明天下雨,你怎么办?; ~9 z* n% A+ f( `
第二种:用在表示要求、建议、命令等的名词从句中3 u" z* C, o# g. w& ^; g- c
从句谓语形式为:“---(should ) + do sth”(在美语中should常省去) 。
- i9 z, E4 j) W; p' V/ [+ p* O 类似用法的动词有:1 w, j8 w H0 I+ P) G
insist (坚持) , suggest (建议) , order(命令) , propose (建议) , demand (要求) , command (命令) , advise (建议) , desire (要求、请求) , request (请求) , require (需要、要求) , ask (要求) , prefer (宁愿), recommend(推荐) , arrange ( 安排) , advocate ( 拥护、提倡) ,maintain(坚决主张)等后面的宾语从句中。* p3 K" m8 e+ p' W* O
第三种:用在“It + be + important (,necessary , natural , essential , strange , absurd , amazing , annoying , desirable, surprising , vital , advisable , anxious , compulsory , crucial , imperative , eager , fitting , possible , impossible , improper , obligatory , probable , preferable , strange , urgent 等, 以及insisted , suggested , ordered , requested , arranged , recommended 等) + that ---”结构中的that 引导的主语从句中- Q3 d Y' \& T5 E! o. e
第四种:用在It is time that --- 结构中, 表示“该干某事了”, 含建议的意思, 用动词过去式。
/ x7 u% l" ~/ ]5 ` It is time (that) we went to bed .5 e. r8 }. c8 m/ S5 B7 f
咱们该睡觉了。) U/ k V2 r8 G# Z
注意: time 前可加about (表示“大约”) 或high(表示“强调”) 等。 |