不定式可以作be的表语(一共有10个系动词可以拿不定式做表语),你说的有do无to 无do有to”原则只不过是那些老师为了让你们应付考试而这样说,跟本没有这样的规定(所以有能力的话还是不要跟着学校的老师学好,学校的老师通常都是用这样所谓的什么技巧来让你们应付考试).这里do是动词 should是情态动词 should 跟动词的原型构成合成谓语,what是疑问代词做宾语 What we should do 是一个主语从句 is 是系动词 to do sth 是表语.不定式分为带to不定式和不带to不定式,如果一个动词做谓语那么这个动词就是不带TO不定式,这句话中后面的那个do不做谓语,所以要带to.这句话是对的.(当不定式做使役动词have,make,let感官动词 see,watch,look at,notice ,observe,hear,listen to,smell,feel,find 等后作宾补时是用不带to的不定式)
关于一个高中英语句型What we should do is to do 不定式作表语是可以的吧,但要按照“有do无to
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