百分数做主语时用什么单三形式？
百分数作主语谓语动词用单数还是复数，要根据百分数后所跟的名词是可数名词还是不可数名词来确定，1.如果所跟名词是可数名词复数则谓语动词用复数，
例如：
Seventy
percent
of
the
apples
are
bad.
这些苹果的百分之七十是坏的
Fifty
percent
of
students
are
here.
主语是students可数
所以是are
2.如果所跟名词是可数名词单数或不可数名词则谓语动词用三单形式。例如：
Seventy
percent
of
the
apple
is
water.
这个苹果的百分之七十是水分
Fifty
percent
of
water
is
here.
主语是water不可数
所以是is
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