4．must用于表示推测，它的肯定程度比may,
might, could大得多，一般只用于肯定句。
①must do (这里的do通常是状态动词或系动词)，表示对现在状态的推测。
He must
be very lazy for his desk is very untidy.
他肯定很懒，因为他的课桌很不整洁。
Carol
must get very bored with her job. She does the same thing every day.
卡罗尔肯定对她的工作厌烦了，她每天都做同样的事。
②must be doing表示对现在动作或状态的推测。
Put on
more clothes. You must be feeling cold with only a shirt on.
多穿点儿衣服，你只穿一件衬衣，肯定觉得冷。
③must have done表示对过去的动作或状态的推测。
The
ground is wet. It must have rained last night.
地面是湿的，昨晚肯定下雨了。
I didn't
hear the phone. I must have been asleep.
我没听见电话铃响，我一定是睡着了。
提示：
must表示推测只用于肯定句，否定句和疑问句要用can,
could来代替must。
He's
just had his lunch. He can't be hungry already.
他刚吃过午饭，不会饿的。
They
have just arrived here. They can't know many people.
他们刚到这里，不可能认识很多人。
Leslie
walked past me without speaking. He can'tcouldn't have seen me.
莱斯利从我身边走过而没打招呼，他肯定没看见我。
5．must可用来表示根据逻辑推理必然要发生的事，可译为“必然会，总是会”。
We all
must die.
我们都会死。
Truth
must be out.
真相必然会大白的。
Winter
must be followed by spring.
冬天到了，春天还会远吗？
6．must有时可用来表示“偏偏”的意思。
Why must
it rain today
为什么偏偏在今天下雨？
When I
was taking a nap, a student must knock at the door.
正当我午睡时，偏偏一个学生在这个时候来敲门。
D．will和would
1.will和would可用于第二人称疑问句，表示请求和建议等。would比will委婉客气。
Will you
have some tea
你喝点茶，好吗？
Will you
share your happiness with us
你可以把你的欢乐与我们共享吗？
Would
you pass this book to the student in the last row
请你把这本书传给最后一排的学生好吗？
必背：
WillWould you ...表示请求和建议的答复。
肯定回答
Yes,
please.是的，请。
Certainly.当然可以。
Sure.当然了。
All
right.好啊！
否定回答
I'm
sorry. I can't.对不起，不行。
No,
thank you.不，不行。
No, I
won't.不，不行。
2．will和would可表示意志、愿望和决心，用于各种人称陈述句。
I will
do anything for you.
我愿为你做任何事。
I will
never tell you the secret.
我永远不会告诉你这个秘密。
None is
so blind as those who won't see.
不愿看的人眼睛最瞎。
They
would not let him in because he was poorly dressed.
他们不让他进去因为他衣着破旧。
3．will和would可表示某种倾向或习惯性动作。will表示现在的习惯动作，would表示过去的习惯动作。
He will
surf the Internet every night.
他每天晚上都在上网。
The boy
will sit there hour after hour looking at the traffic go by.
那男孩常常坐在那儿好几个钟头，看着车辆行人通过。
He would
be nervous when he met strangers.
遇见陌生人时他总是很紧张。
In class
he would ask some silly questions, and his classmates would laugh at him.
课上，他总是问一些蠢问题，他的同学们总是嘲笑他。
4．will可表示固执坚持，这时will不可使用'll的简略形式。用于非人称主语时，表示物体的固有性质和倾向。
I will
take the job, and no one can stop me.
我就要这个工作，没有人可阻止我。
He won't
do what he's told.
他就是不愿按所吩咐的去做。
The
window won't open.
窗子打不开。
This
glass will not crack under heavy pressure.
这种玻璃在重压下也不会破碎。
5．will表示将来时间时，不可用于条件状语从句，但will表示意愿或决心时，可用于条件状语从句。
If you
will read the book, I'll lend it to you.
如果你愿意读这本书，我会把它借给你。
If you
will give up smoking, your health will improve.
如果你愿意把烟戒掉的话，你的健康状况就会好转。
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