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4、have to 的基本用法：
have to和must的意义相近，只是 must侧重表示说话人的主观看法，而have to 则表示客观需要，
如：I must study hard. I had to give it up because of illness.
5、ought to的基本用法
(l)表示根据某种义务或必要“应当”做某事，语气比should强，例如：Everyone ought to obey the traffic regulations.
(2)表示推测，注意与must表示推测时的区别：He must be home by now .(断定他已到家)，
He ought to be home by now .(不十分肯定)，
This is where the oil must be.(比较直率) ，
This is where the oil ought to be. (比较含蓄) ；
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6、dare的基本用法
(l)dare (dared为其过去式) 作情态动词用时，主要用于否定句，疑问句和条件从句中，如：
Dared he bread the traffic regulations again?
I dare say 我认为，习语
(2)在现代英语中dare常用作行为动词，其变化与一般行为动词相同，如：She dares to stay at home alone at night.
7、need的基本用法
(1)need作情态动词用时，主要用于否定句和疑问句中，
如：He needn't worry about us now.
need也可作为行为动词用，可用于肯定句，否定句和疑问句中，其后可接名词、代词、动名词或带 to 的动词不定式为其宾语。
如：You need to practice reading aloud every day.
needn't后接完成式可以表示过去做了一件本来不必要做的事情，
如：---- Did you answer the letter yesterday? ---- Yes, I did. ---- But you needn’t have answered it.
例题：
Mark___have hurried. After driving at top speed, he arrived half an hour early.
needn’t B. wouldn’t C. mustn’t D. couldn’t
8、shall的基本用法
(1)shall用作情态动词时，用于第二、三人称，表示说活人的意愿，可表示“命令”、“警告”、“强制”、“威胁”或“允诺”等意，如：He shall go first, whether he wants to or not. （命令）
You shall have my answer tomorrow. 你明天可以得到我的答复。（允诺）
(2)在疑问句中，shall用于第一、三人称，表示说话人的征询对方意见或请求指示，如：Shall I open the door?
9、should的基本用法
(1)should作为情态动词可以表示“建议”或“劝告”，有“应该”之意，
如：You should learn from each other.
(2)should后接完成 式表示过去没有做到本来应该做的事情，或是做了本来不应该做的事情。
(3)如：You should have give him more help.
阅读短文，从方框中选择适当的动词，并用其适当形式填空，有的需要加助动词成不定式符号 (每词限用一次)
My good friend lives with six hundred animals on an island. Since he left school, he （6）________ all over the world looking for animals for his own zoo. He writes books about his traveling and animals. He was made （7）________ for the animals’ food with the money for his books. Last week he told me he (8)________ oil on the island when he was looking for water. And a little oil can buy enough water for a long time, but if he (9)________ others what he found, it will bring greater trouble to his animals. So the secret must (10)________forever.
6-10.ADBAD
