all of the boys have tried twice,none of the boys has tried twice.

问题描述:

all of the boys have tried twice,none of the boys has tried twice.
前面用have,后面用has.
请告知理由.

正确
前面是all of,表示全部的,所有的
后面是none of ,表示没有一个,所有的都不
all of the boys have tried twice.
None of the boys has tried twice.
意思是1.所有的男孩有尝试了两次.
2.没有一个男孩尝试了两次.