是It have three...还是是It has three...请问这种句型里是用have还是has?

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• Half of the students has made the same mistakes.为什么用has这里是用has 还是 have，老师给的答案好像是has
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• ‘Of ’在此处的用法作何解释?原句：Of particular interest has been the effect of contract violation,请问该句的第一个Of 是怎么用的,我怎么没见过这种语法规则所在段落如下The concept of the psychological contract in its broadest sense has been in use for some time ,but only recently has research attempted to specify and empirically examine what is implicit in terms of reciprocity and exchange within the employment relationship and the effect these beliefs have on key employee and organizational outcome
• advertisement可数吗翻译题,太多的广告已经干涉到人们的正常生活,这里的advertisement 是用too much advertisement还是 too many advertisement 后面跟has 还是have?
• 纠正英语语法例如：Does he have relatives here?这个疑问句用have有错吗?如果错了该用什么?has have had用法是怎样的.分不清楚.还有Are you friends （用Do you friends不对吧?）回答Yes,they are.学得混淆了.课本就是这样的 _____you friends?用am,is,are,do,doesDoes he has a roommate?这句是对的吗？不确定该用has还是have...
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