情态动词shall和should和must的用法
shall 用在第一、三人称作主语的疑问句中，表示征求对方的意见或请示；
用于第二、三人称作主语的陈述句中，表示说话者命令、警告、许诺等的语气；
用在第三人称作主语的陈述句中，表示法律条文等的规定，意为“必须”。
should 表示义务、责任、劝告或建议，意为“应该”，与ought to基本相同；should表示主观，ought to表示客观；
表示预测，意为“应该会；按理说；想必会”；
表示意外、惊讶、纳闷等感情色彩，意为“竟然；到底”。
Shall he come in or wait outside? 他是要进来还是在外边等候？
You shall remain in your seats until all papers have been collected.
在全部试卷收上来之前，你应该坐在座位上。
You should be careful when doing your job. 工作时你应该仔细认真。
We should arrive home before dark. 天黑之前我们应该到家。
How should I know it? 我应该怎么了解它？
新概念英语视频
八年级英语语法知识点归纳总结
新概念电子版

must和have to
1. must表示非常有把握的推测，仅用于肯定句。
You must be tired after the long journey. 长途旅行之后，你一定很累吧。
2. 表示“必须；一定”，must侧重主观，have to 侧重客观。
The children must be back by 4 o’clock. 孩子们4点前必须返回。
3. 表示说话者的感情色彩，暗含不耐烦或与自己的愿望相反，意为“偏要；非要”。
If you must leave, please do it quietly. The baby is sleeping. 
如果你一定要离开，请悄悄地。婴儿正在睡觉。
注意
在回答must的问句时，否定回答通常用needn’t或don’t have to。

Up，Up，and Away！
An adventurer who became the first person to fly across the English Channel on a cluster of balloons has launched a house into the sky just like in the hit movie Up-in reparation for a more ambitious journey and a new record．
Fearless Trappe，from North Carolina，stepped into the cartoon themed home before flying above the Leon International Balloon Festival in Mexico more than a week ago．
The 38-year-old Trappe was using the event as a warm-up for his planned trans-Atlantic flight scheduled for next summer．He aims to complete the 2，500-mile journey in a seven-foot lifeboat carried by 365 huge helium balloons．
The brave man is learning to sail a lifeboat，in case he needs to ditch into the ocean during the danger-filled adventure．
He still fly at between 18，000 feet and 25，000 feet，beating his previous world altitude record of 21，600 feet，and must fly uninterrupted a distance ten times longer than his previous world record of 230 miles in order to succeed．
The adventurer Trappe，who holds records for crossing the Alps，flying the most cluster balloons，and the longest distance，has spent his entire career，building up to this ambitious plan．
“I didn’t wake up one day and think：‘I’ going to fly across the Atlantic，’”he said．“Every attempt before this was prepared for this fight，I’ve been training for a long time”．
1．The adventurer flew across the English Channel to__________．
A．test the balloons          B．launch a house
C．shoot a hit movie         D．prepare for breaking a record
2．To finish the journey，he will fly a distance of__________．
A．2500 miles     B．18，000 feet     C．25，000 feet     D．230 miles
3．About the ambitious journey，which is NOT mentioned in the passage?
A．When he will fly           B．How high he sill fly 
C．How far he will fly         D．How long it will take him
4．How many world records does Jonathan hold?
A．Two           B．Three        C．Four         D．Five
5．What does he last paragraph imply?
A．Trappe can’t sleep worrying about the adventure
B．Trappe was born to set world records
C．Trappe always keeps his ambition in mind
D．Trappe never thought of crossing the Atlantic before

上一篇：

下一篇：