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A sEt oF kEys ArE

a set of keys is 不能用 are, 因为 set 是 N-COUNT (不可数)名词.只允许用 is.a set -- 一套;一组;一系列 , (N-COUNT NOUN) A set of things is a number of things that belong together or that are thought of as a group. a set 还有其它意思,也是不可数.

are

are 改为 is a set of keys 一串keys ,单数

因为这里的these是指these keys,这是复数名词做主语,所以用are.你老师讲的a set of keys的主语是a set,这是单数,所以是单数is.比较一下:A set of keys is on the desk. 桌子上有一串钥匙.These keys are mine. 这些钥匙是我的.同样的用法还包括a pair of, a piece of等等.

应该去掉is:A set of books in the library.老师讲过的,意为一串钥匙在图书馆里

必须是is啦 ~~~a set of 是表示一串,一组,所以用is.一般前面看到这种"a of"的时候,谓语动词都是用单数的,除了一个特例:a number of . a number of 后面接谓语动词的复数形式,和它对应的是"the number of ", 后面接的是谓语动词的单数形式.所以 除了上面的特例,基本上,语义表示整体的概念的时候,谓语动词都是用单数的~~ 不要怕,你自己多找找感觉,多揣摩,敢于判定.加油~~

填: isit A set of keys is on the table. Let me get it .类似A set of keys这样的量词短语作主语时, 谓动根据量词的单复数来决定.此题A set 为单数,故用is,相应地后面就用it 了.又如: A pair of chopsticks is on the table. 桌子上有一双筷子. 10 pairs of chopsticks are on the table. 桌子上有十双筷子.

It's a set of keys 一串钥匙 因为这里的关键词不是keys而是set 指的是这一“串”钥匙,是把这些钥匙看成一个整体,“一串” 望采纳~~~谢谢

用 IS 、因为是 a set of,并不是光 keys . 一串钥匙,为一串,而不是几串,所以为单数,用IS. a pair of 与a set of 一样为单数, 用IS

is the set of keys under a table? the set of keys is under a table.

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