should 动词原形动词过去式

5. 省略连词“if”的条件副词分句，如： a.Were I you, I woulwenku.baidu.com not do such a thing. = If I were you, I would not do such a thing. b.Would the machine break down again, send it back to us. = If the machine would break down again, send it back to us. c.Had you worked harder, you would have passed. = If you had worked harder, you would have passed.
倒 装
全部倒装句有： 1. here, there, now, then, thus，out，away, up,down等副词置于句首, 谓语动词常用be, come, go, lie, run。当其主语为名词时，通常要倒装。 例如： a. There goes the bell. b. Then came the chairman. c. Here is your letter. d. Out rushed a boy and a dog. 注意：如果主语是人称代词则不能倒装。 Here he comes. Away they went.
2. 以there开头的句子，须用倒装, 有there be /there live / stand / lie / exist等。例如： a. There are three books on the desk． b. There stands a tall building in the centre of the town.
原形， were to + 动词原形）
1.You didn’t let me drive. If we ______ in turn you ______ so tired. (NMET96) A. drove; didn’t get B. drove; wouldn’t get C. were driving; wouldn’t get D. had driven; wouldn’t have got
2. so/such...that的so/such位于句首时， Eg.a.So small were the words that he could hardly see them. b.Such a famous man is he that everyone wants to take a photo with him.
5. so, neither, nor表示前面所述一件事也适合另一 个人或物时.so用于肯定句,neither/nor用于否定句. a. Tom can speak French. So can Jack. b.If you don't go, neither will I. 注意：当 so引出的句子表“的确如此”时，不用 倒装。 Tom asked me to go to play football and so I did. ---It's raining hard. ---So it is.
3. 介词短语做地点状语放在句首 Eg. a.Near the bridge was an old cottage. b.In front of the house sat a little boy.
部分倒装句有: 1. 疑问句 a.Have you seen the film? b.When are we going to drink to your happiness? 注意：如疑问词在句中做主语，则用自然 语序。 c. Who is your sister? d.What is our work?
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4. 由as或though 引导的让步状语从句。 表语十as＋主语十系动词be. 动词原形＋as＋主语十助动词.例如： eg. a. Young as he is, he knows some of the family. . b. Try as I might, I could not lift the stone. 注意：当单数名词位于句首时，名词前无冠 词。 eg. c. Child as he is, he knows good English.
3. 否定意义的副词或短语位于句首时，如： in no way, not only…but also, never, little, rarely, seldom, hardly... when, no sooner…than, scarcely…when, in no case, not until等. Eg. a. Not until the child fell asleep did the mother leave the room. b.Hardly can I follow you. c.Seldom do I visit USA. d. Never have I seen such a performance .
2. My goodness, how lucky we are! If there had been places for us on that aeroplane, we _______ dead now. A. will be B. would be C. would have been D. had been 3. _________ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge. A. Were B. Should C. Would D. Will
if 从句 + 主句 if从句 主句
与现在事实 动词过去式（be的 would (should) + 相反 过去式常用were） 动词原形
与过去事实 had+过去分词 相反
与将来事实 动词过去式 相反 （should + 动词
would (should) + have + 过去分词
would (should) + 原形