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Drinking water cannot be too pure.(饮用的水越是纯洁越好。)
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You cannot be too careful.(你无论怎样小心,总不会过分。)
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Not too much can be said about the value of early rising.(早起的好处是说不尽的。)
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I cannot speak too highly of its value.(其价值之高无论怎样说也不为过分。)
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I cannot too much impress upon your mind that labour is the condition which Nature has imposed on us in every station in life.(无论怎样深刻地铭记在心也不会过分,需知在我们人生每一阶段中,大自然所要我们做的就是劳动。)
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(2)cannot 接用 but 时,是把助动词后的主动词 do 或 choose 省略了。
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I cannot but try.= I can do nothing but try.(我不得不试试。)
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I cannot but tell her the truth.(我不得不把真相告诉她。)
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(3)应说 more than you cannot help 的,通常却不用否定。
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I don’t do more than I can help.(我能够不做的我就不做。)
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Don’t tell him more than you can help.(能够不说就不说。)
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英文疑难详解 90.must 的主要用法
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英文助动词的 must,有现在形和过去形两种用法,关于现在形有些什么用法,请分条例解。
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【解答】助动词 must 有下列各种主要的用法:
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(1)表必要( Necessity)或义务( Obligation)时,后接有意志的动词。其否定为 need not,而不是 must not(这是 may 的否定)。
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You must pay the money,but you need not do so now.(你必须付钱,——不过不必现在就付。)
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Must I take his place?—— No,you need not.(一定要我代替他吗?——不一定,你不必代替他。)
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One must eat to live.(人为生存必得饮食。)
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I must have your answer at once.(请你立刻回答。)
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(2)表命令( Command)或劝告( Advice):
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You must go.(你去吧。)
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You must come to the office every day.(每天你要来上班。)
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You must tell me at once.(马上讲给我听。)
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