改为否定句英语？

将肯定句改为否定句,主要是通过增加not, never, no等否定词实现的。改为否定句时需要注意:

1. 将句子中的肯定词语替换为否定词语,如:

some - not any 

always - never 

yes - no

2. 需要注意对主语、谓语、宾语等的否定转换,例如:

He came. - He did not come.

I have seen him. - I have not seen him.

3. 需要注意对助动词、情态动词的否定,例如:

He can swim. - He cannot/can't swim.

She should leave. - She should not/shouldn't leave.

4. 存在特殊的否定结构,如:否定疑问句,例如:

He is here, isn't he?

5. 在一些特定情况下,需要双重否定表达肯定的意思,例如:

I don't have no money. (意为:I do have some money.)

He won't not do it. (意为:He will do it.) 

6. 不定冠词a需要改为不定冠词any的否定形式no,例如:

I saw a cat. - I did not see any cat.

7. 需要注意部分否定词的拼写,如:cannot - can't, will not - won't。

总之,改为否定句要熟练掌握否定词和否定结构的使用,同时对所要否定的内容和结构有清晰的理解,这样才能准确地实现从肯定句到否定句的转换。如果有任何疑问,欢迎提出,我将进一步解答。