一般的英语语法书上没提到 want 是助动词。但是口语中 want to 已成为一套固定的格式,其意义和作用相当于情态助动词 should,ought to 而don’t want to 在不同的上下文里可表示 should not,ought not to 的意思,如:1.You want to mind...
一、若主句的谓语动词是现在时态,从句的谓语动词是非持续性动词,则从句的动词只能用一般过去式: 1.It is(or has been}two months since he fell ill.(不能用has or hadfallen ill)(自)他生病(以来)已有两个月了。 2.It has been(or is...