2、will与be going to do sth区别：
①. be going to表示近期、眼下就要发生的事情，will表示的将来时间则较远一些，如：He is going to write a letter tonight. He will write a book one day.
②. be going to表示根据主观判断将来肯定发生的事情，will表示客观上将来势必发生的事情。He is seriously ill. He is going to die. He will be twenty years old.
③. be going to含有“计划，准备”的意思，而will则没有这个意思，如：She is going to lend us her book.
He will be here in half an hour.
④.在有条件从句的主句中，一般不用be going to,而多用will,如：If any beasts comes at you, I'll stay with you and help you
10. had better的用法：
had better意为―最好‖，没有人称的变化，后面接不带to的不定式，其否定形式为：had better not。如：
We had better go now.我们最好现在就走。You had better not give the book to him.你最好不要把这本书给他。
考点二：含有情态动词的疑问句的回答:
1.对may引出的问句，可以有下列回答方式：Yes,you may. Yes, of course. Yes, certainly. Sure . No, you mustn’t. No, you can’t.
2.对must引出的疑问句，回答方式为：Yes, …must. No,… needn’t/ don’t have to.
3.could在疑问句中，表示委婉的语气，此时could没有过去式的意思。如:Could you do me a favour?你能帮我个忙吗？—Could I use your pen?我能用一下你的钢笔吗?—Yes, you can.可以。（注意回答）
4. shall引出的疑问句用于第一人称，表示征求对方意见或客气的请求。其回答方式有以下几种： Yes, please. All right. No, thank you.
5.would you…的回答方式有以下几种：Yes, I will. (No, I won’t.) Sure . (I’m sorry , I can’t.) All right/ OK/ With pleasure. Certainly. (No, thank you .) Yes, please.
【例题】—Would you do me a favour and pass on my thanks to Lily?—________.
A.That’s right B.With pleasure C.It doesn’t matter D.No trouble
【解析】A.意为―对了‖，B.意为―乐意效劳‖, C.意为―没关系‖ D.意为―不费事‖。答案：B
考点三:不同情态动词的否定意义也不同：
1.（1）.can’t可译为―不会‖，如：I can’t play basketball.我不会打篮球。
（2）当句子表推测时，用can’t表达不可能，如：He can’t be ill. He is playing chess with Tom.