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Obligation and Necessity.
义务和必要
1)Typical Expressions
经典英语句型
I must tell you the truth.
我必须把实情告诉你。
Must you go now?
你一定要现在走吗？
He must go now,it's getting late.
他得走了，时间不早了。
The bus is coming.I've got to go.
车来了，我得走了。
You should tell me earyly about that.
你应该把这件事早点告诉我。
We need to buy some gifts for her birthday.
我们需要给她买点生日礼物。
I am supposed to attend the meet in Beijing next month.
我得参加下个月在北京举行的会议
You are supposed to finish the homework before going home.
你们得在回家之前把作业完成。
It's necessary to go over the lesson right now.
有必要现在复习课文。
Is it necessary to go to the hospital to see the doctor?
是否有必要到医院去看医生？
Ought I to see the doctork,do you think?
你认为有必要到医院去看医生吗？
Must we dress up for her birthday **?
对参加她的生日聚会我们是不是一定得穿礼服？
Do I have to go before next Wednesday?
是不是下个星期三我一定得去？
You have to make a dialogue about the situations before we finish the class.
我们下课之前你们要就这个情景做一个对话。
We don't have to give it to him?
我们不必把这个给他？
Should we speak in English at the meeting?
在会上我们是否一定得说英语？
You needn't go out to work after the first baby.
生完第一个孩子以后你不必去工作。
There is no need for them to change the time.
他们不有必要改变时间。
He should have come.
他本应该来。
Dialogue 1
英语对话1
A o I have to watch my hands before supper?
吃饭之前我是不是一定得洗手？
B:Yes,dear.
是的，亲爱的。
A:Then,do I need to use the soap?
那我是不是一定得用肥皂？
B:No,you needn't.Just use the clean water.
不必要，就是清水洗净就行了。
B:Ok.
好吧。
Dialogue 2
英语对话2
A:Mum,do I need to go to see the doctor?
妈妈，我需要到医药去看医生吗？
B:No,I don't think so.But you must stay at home hor a day or two.
我想不必要。但是你得在家里呆上一两天。
A:Must I?
是吗？
B:Yes,I am afraid you must.
是的，我想你必须这样。
A:Should we tell the teacher about that?
我们是不是得告诉老师呢？
B:Yes,of course.You ought to tell him as soon as possible.
当然。你应该及早地告诉他。
太急燥了，要平心静气
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