英语肯定句变否定句
转变方法在be动词或情态动词后面直接加not.
没有be动词也没有情态动词，有实意动词(表示动作的动词)的肯定句变否定句。
转变方法借助助动词（do, does, did）来帮助否定
肯定句变否定句的其他方法
1、动词have/has的特殊说明
①当have表示“某人有什么的时候”，其否定形式为have not/has not
例 She has two books.
→ She has not two books.
②当have作为实意动词时，其否定形式为 do not have/does not have
例 You have dinner.
→You do not have dinner.
③当have在完成时中作为助动词时，其否定形式为have not/has not
例 I have seen this film.
→ I have not seen this film.
2、一些特殊说明
①肯定陈述句中的some/too，在否定陈述句中应改为any/either。
例1.He has some milk.
→ He hasn’t any milk.
例2. I have books. She has books,too.
→ I have not books. She has not books,either.
②肯定陈述句中若有and连接两个并列的成分，在否定陈述句中通常应改为or。
例 There are students and teachers in the classroom.
→There are not students or teachers in the classroom.
