1.Don't stay up late if I was late.

1。Don't stay up late if I was late。（1）请问这句话有语法错误么?（if前是一般现在时,而后面是过去式。。不太对吧?）（2）它的意思是“如果我回来晚,不要熬夜太晚”吗?如果不是,怎么改。Answer:此句有两种改法(1)if 引导纯条件句If I am late,don't stay up late。(2)if 引导虚拟条件句If I were late,don't stay up late。(注:虚拟条件句也根据情况,用"错综时态"即前面时态不一致,这里从句用过去时,表示对将来的虚拟,主句表示一个命令要求)2。Like a scientist bent on making a dicovery。不应该是be bent on吗?be动词去哪里了?Answer:此句不是一个句子,"bent on making a dicovery"过去分词短语作后置定语修饰"scientist"相当于定语从句的简化形式。Like a scientist bent on making a dicovery=Like a scientist who is bent on making a dicovery