有非常详尽的讲解,是笔者多年一点一点的积累。
注意：
1). 当think, believe, suppose等动词后面跟宾语从句时，通常用否定主句谓语动词来达到否定从句谓语动词的目的。如：
I think they can come tonight. →I don't think they can come tonight.
2). 当must表示推测，表示“一定；肯定”的含义时，否定句应用can't。如：
He must be in the room. →He can't be in the room.
2. Peter often has bread for his breakfast. (改为否定句)
Peter ___________ ___________ bread for his breakfast.
答案：doesn’t, have
解析：本句考查have/has做行为动词的否定形式。 本题中has 不表示“有”而是表示动作，否定应该用doesn’t have,不能用has not. 注意：英语中当have/has表示“开会”；“吃饭”；“拥有（好时光）”等意思时，用作行为动词。
3. I have already received some Christmas cards from my friends. (改为一般疑问句)
___________ you received ___________ Christmas cards from your friends yet?
答案：Have, any
解析：本题考查陈述句改为疑问句。
陈述句改为疑问句一般有三种情况：一是改为一般疑问句，二是改为反意疑问句。三是改成特殊疑问句即划线提问。如:
1). The students had learned about 1,000 English words by the end of last term. （改为一般疑问句） →Had the students learned about 1,000 English words by the end of last term? （完成反意疑问句）
4. Jack hardly knows anything about the car accident. (改为反意疑问句)
Jack hardly knows anything about the car accident, __________ ___________?
答案：does, he
解析：本题考查陈述句改为疑问句。改反义疑问句应注意，若句子的主要部分用肯定，附加部分用否定，反之则相反。但要注意前句表示否定意义的副词如：hardly, never, seldom, little, few等，这时反义疑问句要用肯定形式。若祈使句的反义疑问句，仅Let’s…句型用shall we，