4. A. The pupils all don't like the maths teacher 和 B. The pupils all dislike the maths teacher 的意思相同吗?
析:这两句意思不相同。 all, both, every 等词与 not 连用时,通常表示部分否定。若 all, both, every 等词与 dislike, impossible, invisible, disbelieve, unkind, useless 等含否定前缀或后缀的词连用时,则表示全部否定。比较: Both of the twins cannot dance. 这对双胞胎并不都会跳舞。 Everybody here is useless to me. 在这里,每一个人在我看来都没有用。 Every one of them doesn't believe you wrong. 他们并不是每个人都认为你错。
5. A. I don't know English and French.
B. I don't know English or French.
这两个句子有什么区别?
析: not A or B 表示全部否定, not A and B 会产生歧义。句 A 的意思可以是: I know neither English nor French. 或: I know English, but I don't know French. 如果要表示全部否定,并且不至于产生歧义,你最好用 not A or B 结构。但是,下列结构中的全部否定,应用 and 表达,而不用 or :
A. 简单句中出现两个否定词。如: Men cannot live without air and water.
B. 各列举成分前面都有否定词。如: It has no eyes and no ears.
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