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1.all, both同属前位限定词,但all可以与三类名词搭配,both只能与复数可数名词搭配,从意义上讲both指两者,all指三者或三者以上。如: How much time will you take for all this work? All children can be naughty sometimes. I got both these vases in Spain. Both cats are asleep. all和both用于否定时表示部分否定。例如: I cannot promote both of you. 我不能使你们两个都提升。 All flowers in his garden are not red. 他花园里的花并非都是红色的。 Both (of them) are not my brothers. 他们两个之中,只有一个是我的兄弟。 另外,表示部分否定的词还有every (everyone)。 例如: Every man can not be a poet. 并非人人都可以成为诗人。 要表达全部否定要用none / no (nobody) , neither, either等。例如: I cannot promote either of you. 你们两个我都不能提拔。 No flower in his garden is red. 他花园的花都不是红的。 2.all 和every从意义上十分相近,都用来泛指人或物,然而两者各自与名词搭配的类别不同,every只能与单数可数名词连用。如: All Mondays are horrible. (= Every Monday is horrible. ) all后可以跟the或this, my等限定词,而every却不行。例如: All the boys of this class are able to run faster than their teacher. 试比较: She was here all day.她在这里呆了一整天。 She was here every day. 她天天都在这里。
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