the big theatre---- seat more than 1500 people.A can B is ab
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the big theatre---- seat more than 1500 people.A can B is able to C need D should
A和B答案有什么区别?
A和B答案有什么区别?
考察词义辨析,can表示我能是说我 【有时 能够】,比如说我能够喝很多酒,是我能喝但并不一定是此刻,be able to强调主观,主语是人的情况较多,且多为成功做好某事,或逃生成功的特殊语境
下面是官方说法,有点复杂但很全面,上面的是考试的侧重点
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.
下面是官方说法,有点复杂但很全面,上面的是考试的侧重点
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.
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