英语常见、常考的句型句式可分为以下几类：
1.陈述句
(1)肯定句：是指用肯定的语气来陈述的句子，
如：I’m a student.
He works in a hospital.
I watched TV yesterday evening.
(2)否定句：含有否定词或表示否定意义词的句子，如：I’m not a student.
He does not (doesn’t) work in a hospital.
I did not (didn’t) watch TV yesterday evening.
【肯定变否定：常在be动词、助动词do/does/did、情态动词must/should后在否定词not. 】
2. 疑问句
一般疑问句：是指询问事实的句子，此类句子必须用“yes”，或“no”来回答。
特殊疑问句：以特殊疑问词(what , where , who , which , when , whose , why , how等)开头引导的句子。此类句子应该问什么就答什么，不能用“yes 、no”来回答。
（1）针对数量提问的特殊疑问句的基本结构是：
How many+ 名词复数 + are there + 介词短语?
Howmuch + 不可数名词 + is there + 介词短语?
（2）针对主语提问的特殊疑问句的基本结构是：What’s + 介词短语?
3.否定疑问句
——你不是学生吗? ——不，我是学生。
[误] ——Aren’t you a student? ——No， I am.
[正]——Aren’t you a student? ——Yes， I am.
[解析] 对否定疑问句的回答是用Yes还是用No，这取决于实际情况：如果事实是肯定的，就用Yes；如果事实是否定的，就用No。
4.句子单数变复数，注意以下五要素
(1)主格人称代词要变成相应的复数主格人称代词,即I→we, you→you，she,he,it→ they。
如：She is a girl. →They are girls.
(2)am，is要变为are。如：I’m a student. →We are students.
(3)不定冠词a，an要去掉。如：He is a boy. →They are boys.
(4)普通单数名词要变为复数形式。如：It is an apple. →They are apples.
(5)指示代词this，that要变为these，those。如：This is a box. →These are boxes.
二、句式中常出现的缩写
1、写出完全形式：
1.who"s=who is
2.she"s = she is
3.he"s = he is
4.what"s = what is
5. where’s= where is
6.we"re = we are
7.you"re = you are
8.that"s = that is
9. I"m = I am
10. isn"t = is not
11.aren"t = are not
12.they"re = they are
13.don"t = do not
14.let"s = let us
15. can’t = can not
16. it"s = it is
17. I’ve = I have
18. I’d = I would
19. hasn’t = has not
