英语全部语法

一． 时态：

1. 一般现在时表示一般性，经常性的动作或一般性事实。u 含有be动词的句子He is a teacher. Tim and Jack are students. ★变疑问句将be动词移到句首 Is he a teacher? Are Tim and Jack students?★变否定句在be动词后面加not He is not a teacher. Tim and Jack are not students.★肯定回答及否定回答Yes, he is. No, he is not. Yes, they are. No, they are not.u 不含有动词的句子，即含有一般动词的句子

第三人称单数及单数名词 He likes books. The dog likes bones.★变疑问句在句首加does, 动词变为原型 Does he like books? Does the dog like bones?★变否定句在主语及动词之间加doesn’t, 动词变为原型 He doesn’t like books. The dog doesn’t like bones.★肯定回答及否定回答：Yes, he does. No, he doesn’t. Yes, it does. No, it doesn’t.注意：第三人称单数形式一般在动词后面加S，不要和名词复数混淆，变否定句或疑问句时名词复数没有任何变化。 其他人称及复数名词 I want to have a bath. The students like smart teachers. ★变疑问句在句首加doDo you want to have a bath? Do the students like smart teachers?★变否定句在主语和动词之间加don’t.You don’t want to have a bath. The students don’t like smart teachers. ★肯定回答及否定回答Yes, I do. No, I don’t. Yes, they do. No, they don’t. 2. 现在进行时 表示现在正在进行的动作。 构成： 主语＋ be动词＋动词的现在分词＋其它成分（现在分词的构成见附录） The dog is running after a cat. The boys are swimming across the river.★变疑问句将be动词移到句首 Is the dog running after a cat? Are the boys swimming across the river?★变否定句在be动词后面加 not The dog is not running after a cat. The boys are swimming across the river.★特殊疑问句：what, which, how, where, who, etc.疑问词＋动词＋主语＋现在分词 What is the dog doing? (必背 )没有进行时的动词表示状态，思想，感情和感觉的动词不能表示正在进行的动作 1. 表示感觉，感官的词 see, hear, like, love, want, 2. have, has当”拥有”讲时没有进行时

3. 一般过去时 表示过去发生的动作或事件， 常和表示过去的时间状语连用，如 yesterday, last night, the day before yesterday, 3 days ago, 含有be动词的句子， 将动词变为过去式，am, is的过去式为was，are的过去式为were