英语句子变否定句的方法，和改一般疑问句的方法，快！！

1. 由系动词am，is，are构成的句子：变一般疑问句时把am，is，are提到句子的前面，句尾用问号即可。变否定句时直接在am，is，are后面加not即可。例如：
肯定句:He is a student.
一般疑问句: Is he a student?
否定句: He is not a student.
反问句: He is a student, isn't he?
He isn't a student, is he?
画线提问: 对he提问: Who is a student?
对 a student 提问: What is he? or What does he do?

2. 由情态动词can, may, should等构成的句子: 变一般疑问句时把can,may,提到句子的前面,句尾用问号即可.变否定句时直接在can,may,后面加not即可. 例如:
肯定句: She can swim.
一般疑问句: Can she swim?
否定句: She can not swim.
反问句: She can swim, can't she?
She can not swim, can she?
画线提问: 对she提问: Who can swim?
对swim提问: What can she do?

3. 由行为动词构成的句子: 需要加助词do或does. 变一般疑问句时把do/does放在句子前面. 例如:

肯定句: They play football after school.
一般疑问句: Do they play football after school?
否定句: They don't (do not) play football after school.
反问句: They play football after school, don't they?
They don't play football after school, do they?
画线提问: 对they提问: Who play football after school?
对play football提问: What do they do after school?
对after school提问: When do they play football?

帮我个忙，用就是用反问句写出yes...或no... 帮个忙吧！

否定句：* 有be动词的句子，直接在be动词的后面加not 如：
she is not a teacher.
they were not watching tv.
* 没有be动词的句子，要用到助动词来完成否定 如
she doesn't like english.
they didn't want to watch tv.

疑问句： 有be动词的句子，将be动词提前，其余照抄，用问号结尾 如：
is she a teacher?
were they watching tv?

没哟be动词的句子，要用到助动词来构成疑问语序， 如：
does she want to be a teacher?
did they watch tv last night?