新概念(Can,could and be able to有什
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:英语作业 时间:2024/07/08 18:04:37
Can,could and be able to有什么区别? 例:.................(Can iAm i able to)use your phone for a moment please?
![新概念(Can,could and be able to有什](/uploads/image/z/19435035-3-5.jpg?t=%E6%96%B0%E6%A6%82%E5%BF%B5%28Can%2Ccould+and+be+able+to%E6%9C%89%E4%BB%80)
解题思路: Can,could and be able to有什么区别
解题过程:
1)can could 表示能力;可能 (过去时用could),
只用于现在式和过去式(could)。be able to可以用于各种时态。
They will be able to tell you the news soon. 他很快就能告诉你消息了。
2)只用be able to
a. 位于助动词后。
b. 情态动词后。
c. 表示过去某时刻动作时。
d. 用于句首表示条件。
e. 表示成功地做了某事时,只能用was/were able to, 不能用could。
He was able to flee Europe before the war broke out.
= He managed to flee Europe before the war broke out.
注意:could不表示时态
1)提出委婉的请求,(注意在回答中不可用could)。
--- Could I have the television on?
--- Yes, you can. / No, you can't.
2)在否定,疑问句中表示推测或怀疑。
He couldn't be a bad man.
他不大可能是坏人。
can用于表示“能力”时是指现在的能力,过去或将来的能力通常用was/were able to或will/shall be able to表示。
eg. She was able to go to school yesterday.
Soon she will be able to swim a quarter of a mile.
Can的过去式形式could也可用于表示泛指过去的能力。如:
I could read when I was four.
但不能用于表示特定的某一过去能力,如不能说:
*He could swim halfway before he got tired.
He was able to swim halfway before he got tired.
上述这种用法的区别不存在于否定句中。在否定句中,couldn’t与was/were not able to 可以互换使用。
eg. I couldn’t see him again before he left.
I wasn’t able to see him again before he left.
另外,要说一个阶段延续至今的能力,可用have/has been able to表示。
eg. John has been able to swim for many years.
注意的一点是:can也可以用于表示“许可”。它可以表示现在许可或将来许可,过去许可用could表示,此时一律不能用be able to的某种形式替换。
最终答案:略
解题过程:
1)can could 表示能力;可能 (过去时用could),
只用于现在式和过去式(could)。be able to可以用于各种时态。
They will be able to tell you the news soon. 他很快就能告诉你消息了。
2)只用be able to
a. 位于助动词后。
b. 情态动词后。
c. 表示过去某时刻动作时。
d. 用于句首表示条件。
e. 表示成功地做了某事时,只能用was/were able to, 不能用could。
He was able to flee Europe before the war broke out.
= He managed to flee Europe before the war broke out.
注意:could不表示时态
1)提出委婉的请求,(注意在回答中不可用could)。
--- Could I have the television on?
--- Yes, you can. / No, you can't.
2)在否定,疑问句中表示推测或怀疑。
He couldn't be a bad man.
他不大可能是坏人。
can用于表示“能力”时是指现在的能力,过去或将来的能力通常用was/were able to或will/shall be able to表示。
eg. She was able to go to school yesterday.
Soon she will be able to swim a quarter of a mile.
Can的过去式形式could也可用于表示泛指过去的能力。如:
I could read when I was four.
但不能用于表示特定的某一过去能力,如不能说:
*He could swim halfway before he got tired.
He was able to swim halfway before he got tired.
上述这种用法的区别不存在于否定句中。在否定句中,couldn’t与was/were not able to 可以互换使用。
eg. I couldn’t see him again before he left.
I wasn’t able to see him again before he left.
另外,要说一个阶段延续至今的能力,可用have/has been able to表示。
eg. John has been able to swim for many years.
注意的一点是:can也可以用于表示“许可”。它可以表示现在许可或将来许可,过去许可用could表示,此时一律不能用be able to的某种形式替换。
最终答案:略
can could be able to
be able to 和could/can 有什么分别
be able to、can、could的区别
选词填空(can/could be able to)
can,could和be able to的区别
be able to和could
be able to和can
could和be able to的区别
can/could和be able to在这两个句子里的区别,为什么不能替换
be able to 与 can的区别:为什么不能说:All the people could escape from
关于 be able 我看语法书上写的be able to表示成功的做成某事,不能用could.而新概念2册的62课 F
ability to do\be able to \can