1704926810
1704926811
有时会：
1704926812
1704926813
Children can be very tiring．孩子有时很令人头疼。
1704926814
1704926815
In winter, the winds can be pretty cold．冬天风有时很冷。
1704926816
1704926817
Mary could be pretty naughty when she was a child．玛丽小时候有时很调皮。
1704926818
1704926819
不相信或惊异（多用于否定句或疑问句）：
1704926820
1704926821
He can’t be more than thirty．他不可能超过30岁。
1704926822
1704926823
How can you be so conceited？你怎么能这样高傲？
1704926824
1704926825
How could you be so stupid？你怎么会这样傻？
1704926826
1704926827
后面的动词可用完成或进行形式：
1704926828
1704926829
Where can he have gone？他能到哪里去了呢？
1704926830
1704926831
They can’t have gone out because the light’s on．他们不可能出去了，因为灯还亮着。
1704926832
1704926833
They couldn’t have left so soon．他们不可能走得这么早。
1704926834
1704926835
Who could have taken it？是谁把它拿走了呢？
1704926836
1704926837
What on earth can he be doing？他能在干什么呢？
1704926838
1704926839
They couldn’t be still waiting for us．他们不可能还在等我们。
1704926840
1704926841
could还有一些特殊用法：
1704926842
1704926843
用于虚拟条件句：
1704926844
1704926845
You could get a better job if you spoke a foreign language．如果你能讲外语，你可以找到好一点儿的工作。（但你不能）
1704926846
1704926847
We could have caught the train if we had left a little earlier．要是我们动身稍早一点儿，我们就能赶上火车了。
1704926848
1704926849
I could have won the race if I hadn’t fallen．如果我没摔跤是可能赛赢的。
1704926850
1704926851
用于温和的批评：
1704926852
1704926853
You could ask me before you use my phone．你打电话之前可以问我一声。
1704926854
1704926855
You could have helped me—why did you just sit and watch？你本可帮助我的，为什么只坐在一旁瞧着？
1704926856
1704926857
You could have been a little more considerate．你本可考虑得更周到些的。
1704926858
1704926859
“could＋不定式的完成形式”可用来谈过去的事，表示：
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