1. I think it’s a good idea.
　　误:I think it’s not a good idea.
　　正:I don’t think it’s a good idea.
　　析:英语中think, believe, expect, suppose等表示信念、揣测等主观看法的动词,后接宾语从句,习惯上将从句否定转移到主句上,即否定主句谓语,不否定从句谓语。
　　2. He can sing this song and that one.
　　误:He can not sing this song and that one.
　　正:He can not sing this song or that one.
　　析:肯定句中的连词and在否定句中一般要改为or。
　　3. Tom went to school too.
　　误:Tom didn’t go to school too.
　　正:Tom didn’t go to school either.
　　析:too和also用于肯定句,either用于否定句。
　　4. He has had supper already.
　　误:He hasn’t had supper already.
　　正:He hasn’t had supper yet.
　　析:随着对谓语动词的否定,某些副词也要作相应的变动。
　　5. He had a good rest just now.
　　误:He hadn’t a good rest just now.
　　正:He didn’t have a good rest just now.
　　析:have在开会、吃饭、休息、进行体育锻炼这些词组中,是行为动词,否定句加助动词来完成。
　　6. Let’s do it like this.
　　误:Let’s don’t do it like this.
　　正:Don’t let’s do it like this.
　　正:Let’s not do it like this.
　　析:let后接的是不带to的不定式,变为否定时,直接在句首加Don’t,或在不定式前加not。
　　7. He always gets there on time.
　　误:He doesn’t always get there on time.
　　正:He never gets there on time.
　　析:He doesn’t always get there on time.意为“他并非老是准时到那儿。”是部分否定,习惯上把句中的副词改为相应的表示否定的副词即可。如:It often rains here./It seldom rains here.
　　8. Be here early tomorrow.
　　误:Be not here early tomorrow.
　　正:Don’t be here early tomorrow.
　　析:祈使句的否定,一般在谓语动词前加do not 的缩写Don’t。
　　9. You had better come.
　　误:You didn’t have better come.
　　正:You had better not come.
　　析:had better相当于一个情态动词,不可分割,因此not 应放在其后。would rather也是如此。
　　10. Both Tom and Xiao Ping went to school.
　　误:Both Tom and Xiao Ping didn’t go to school.
　　正:Neither Tom nor Xiao Ping went to school.
　　析:一个句子中如果有不定代词both, all, every改为否定时,要把这些不定代词改为相应的表示否定的代词。