1. 与现在的事实相反:[If --- + were/did---, --- + would do---]</p> If I were you , I would marry him.
0 ~' i4 U+ L: t" r' K! E; d( O 如果我是你,就会嫁给他。
: w) ^* ~+ _1 ?: n 2. 与过去的事实相反:[If --- + had done---, --- +would have done---]
( T& P6 \" N$ F If you had worked hard , you would have passed the exam.
" E- X2 S6 Z! l/ ]% c6 ?7 S! i 如果你用功学习,就会通过考试了。/ q2 [% w0 j9 z8 H: `4 M
3. 与将来的事实可能相反:[If ---+ should do---, ---+ would do---]$ }5 H Q1 i& }) w& Z+ Y, h
If it should rain tomorrow , what would you do ?0 @( I8 X; W3 j1 p
如果明天下雨,你怎么办?. l9 H; y0 o, u" }4 C
第二种:用在表示要求、建议、命令等的名词从句中8 E) A8 n1 U8 o
从句谓语形式为:“---(should ) + do sth”(在美语中should常省去) 。5 [4 ?; ]: @5 e- t& X E9 E! Z# K
类似用法的动词有:
' w+ A. s; c9 ` 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。
6 [+ W' V3 i5 D5 T 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
5 \1 e1 C6 J: F8 G 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。! t3 A8 z2 w' \% `. z5 O! I$ f
It is time (that) we went to bed .
/ a0 |3 O+ i! u 咱们该睡觉了。+ Y/ [) r: O" Y9 Y
注意: time 前可加about (表示“大约”) 或high(表示“强调”) 等。 |