Question

英语怎么改否定句？举个例子！详细简单！

Answer 1

陈述句变否定句的方法：
句中有动词be( am ,is , are ,was ,were),情态动词（can / could , may , must ，will , would 等），助动词（如完成时态中的HAS / HAD ），变否定句时直接在这些词后加NOT ；否则要加助动词Do ,Does （主语第三人称单数）,Did （一般过去时），原来的动词要还原；另外，句中有SOME 是一般改为ANY ，如果有AND 要改为OR，（因为否定句中的并列要用OR）already 改为yet（且放在句末）；祈使句的否定句是直接在句首加Don’t ;

( 如Open the doo r,please .-> Don’t open the door ,please .) 不定式的否定句是在不定式前加NOT ，如 She asks the boy not to play in the street .
He is a student .-> He isn't a student.
There are some flowers in the room .-> There aren't any flowers in the room .

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追问

有例子吗？

追答

1 Open the doo r,please .-> Don’t open the door ,please .
2 She asks the boy not to play in the street .
3 He is a student .-> He isn't a student.
4 There are some flowers in the room .-> There aren't any flowers in the room .
5 He has finished his homework .-> He hasn't finished his homework.
6 He can swim .-> He can't swim .
7 He went to the park last Sunday. -> He didn't go to the park last Sunday.
8 I like English .-> I don't like English.
9 She likes singing .-> She doesn't like singing .
10 They will finish the work tomorrow.-> They won't(= will not ) finish the work tomorrow.

Answer 2

I like dog.
I don't like dog.
一般do开头的疑问句或肯定句要否定的话，在主语后面加don't就可以了
did开头的主语后加didn't

Answer 3

在be动词后面或助动词后面加not