He is a doctor(1)is a doctor一般疑问句，及肯定否定回答：变化的方法：否定句：变化的方法：(2

我知道的就这么多,不知道行不行
1)is a doctor
一般疑问句，及肯定否定回答：Is he a doctor?Yes,he is./No,he isn't.
变化的方法：be动词最关键，通常这样的句子，不管是第几人称，陈述句把主语放到第一位，be动词放在主语后面，然后接职业等 。
否定句：He is not/is't(缩写形式)a doctor.
变化的方法：be动词依然最关键,陈述句的否定形式,只要在is(be动词) 后面加not.
(随便再告诉你,不管是第几人称,只要是这样的形式,都是在be动词(is,am,are)前后变化.若是疑问句,就把be动词放在句首就行了,其他的照抄就OK了
(2)They like English very much.
一般疑问句既肯定否定回答：Do they like English very much?Yes,they do./No,they don't.
变化的方法是：这也是个一般疑问句,在没有be动词的情况下,就要用助动词do.道理和上面的一样.
否定句：They don't like English very much.
变化的方法是：肯定形式改否定形式时,没有be动词就用助动词do,然后还跟上面一样,在后面加not.
(还有,变一般疑问时,也只要把do 放到最前面)
(3)He does his homework at home.
一般疑问句及肯否定回答：Dose he do his homework at home? Yes,he dose./No,he dosen't.
变化方法是：助动词do用在第三人称单数时,要加es.既然还是助动词,只要把他放在最前面就行啦.而疑问句前面已经用了dose后面的就不用加es了.
否定句：He doesn't do his homework at home.
变化方法是：陈述句在助动词后加not啊

1.Is he a doctor? Yes, he is. No, he isn't.
He isn't a doctor.
2.Do they like English very much?
Yes, they do. No, they don't.
They don't like English at all.
3.Does he do his homework at home?
Yes,he does. No, he dosn't.
He doesn't do his homework at home.
就这样

1.Is he a doctor? Yes, he is. /No, he isn't. He isn't a doctor.一般疑问句把系动词is提前.肯定回答用Yes,否定用No,加主语再加谓语.否定句把系动词后加not.
2,3题同理总之,陈述句变疑问句是把助动词或系动词提前.回答时肯定,用YES,主语 +谓语动词.否定是加NOT
OK 就这么多了
呵呵 希望你满...

1.Is he a doctor? Yes, he is. No, he isn't.
He isn't a doctor.
2.Do they like English very much?
Yes, they do. No, they don't.
They don't like English at all.
3.Does he do his homework at home?
Yes,he does. No, he dosn't.
He doesn't do his homework at home.