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.
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.
答
对，前面是所有的男孩是复数，而后面的none代表单数
答
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.