几道关于情态动词的英语题目:1.Would you be so kind as to keep an eye on my house while I am away?(so+adj.+as to do sth怎么理解,这里的Would 能不能改为Can或Could,原因)2.Should the pain return,take one of these pills.怎么理解这个should 3.He ordered that Tom should leave th house at once.这里的should可以换成must吗?原因.4.There is a knock at the door.Who can it be?这里的can能改成may?原因.5.-Can you go swimming wiht us this afternoon?-Sorry,I can't.I ____ take care of my little sister at home because my mothe

问题描述:

几道关于情态动词的英语题目:
1.Would you be so kind as to keep an eye on my house while I am away?
(so+adj.+as to do sth怎么理解,这里的Would 能不能改为Can或Could,原因)
2.Should the pain return,take one of these pills.怎么理解这个should
3.He ordered that Tom should leave th house at once.这里的should可以换成must吗?原因.
4.There is a knock at the door.Who can it be?这里的can能改成may?原因.
5.-Can you go swimming wiht us this afternoon?
-Sorry,I can't.I ____ take care of my little sister at home because my mother is ill.
A.can B.may C.would D.have to
6.-Mr.Smith must have been to your home this morning.
-No,he ______,because he didn't know my address.
A.couldn't B.can't C.mustn't D.may not

1as to do 是结果状语 一般请求 用 would 较好 有愿意不愿意 的含义 如果用could 则侧重于能力
2这是与将来 情况可能相反的虚拟条件句 省略了if 从句要部分倒装 即 用疑问句语序
意思是 万一疼痛复发
3主句的谓语 是 请求 建议 命令 要求 时 宾语从句的谓语用虚拟语气 即should 加动词原形
should 可以省略 不能用must 替换 这是规定
4可能是谁呢?这是推测 can 表示泛指的 一般的可能 may 表示特指的 具体的可能
如果 用may 含义是 这次 敲门 的 又会是谁呢 ?
5 答案是D.have to 必须 不得不
6 A. couldn't 不可能

1. 表达请求,不表达能力;
2. 表达假设;
3. 表达要求,不表达必须;
4. IT指代未知的人,这里人用CAN,不用MAY,请仔细体会一下差异;
5. HAVE TO,表达行为受限;
6. COULDN‘T,作为CAN的过去否定式;

1.so+adj.+as to do sth 做结果状语 would表示委婉的请求,could也有这种用法.
2.should表示一种条件,可译为:万一
3.动词order后宾语从句用虚拟语气,从句谓语用should+动词原形或直接用动词原形.
4.can be 常用于否定句或疑问句中表示不太肯定的猜测;may be 一般用于肯定句中表示不太肯定的猜测.
5.D have to 表示客观上的必须.
6.A 上句时间为 this morning,视为过去时间,could 这里作为can 的过去式对待.