(1) 不会, 如:
I cant speak English . 我不会说英语。
(2) 不能, 如:
We cant do it now because its too dark.
天太黑了, 我们现在干不了。
(3) 不可能, 如:
那个人不可能是咱们老师, 他年轻得多。
The man cant be our teacher because he is much younger than our teacher..
2. mustnt 意为 禁止、不许, 用来表达命令,表示强烈的语气。 如:
You mustnt play football in the street. Its too dangerous.
你不可以在街上踢足球, 太危险了。
易混点五 must 和 have to
1. must 侧重于个人意志和主观上的必要, 还可以在间接引语中表示过去的必要或业务。
2. have to 侧重于客观上的必要,可用于现在时、过去时和将来时。如:
I know I must study hard.
我知道我必须努力学习。
My brother was very ill, so I had to call the doctor in the mid-night.
我弟弟病得厉害, 我只得半夜里把医生请来。
I havent got any money with me, so Ill have to borrow some from my friend.
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