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：
1704926860
1704926861
那时（不）可能：
1704926862
1704926863
I do not see how I could have done otherwise．我看不出那时我还能有别的做法。
1704926864
1704926865
She could not have been more than sixteen．那时她不可能超过16岁。
1704926866
1704926867
I couldn’t have won, so I didn’t go in for the race．我不可能获胜，因此我没参赛。
1704926868
1704926869
本来可以（但没那样做）：
1704926870
1704926871
I could have lent you the money. Why didn’t you ask me？我本来是可以借钱给你的。你为什么没向我借？
1704926872
1704926873
You could have been a little more careful．你本可细心一点儿的。
1704926874
1704926875
I could have gone with you, because I was there at that time．我本来可以和你一道去的，因为那时我也在那里。
1704926876
1704926877
差点儿做了某事（但还没有这样做）：
1704926878
1704926879
I was so angy I could have killed him．我是那样生气，差点把他杀了。
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