条件状语从句
1)“祈使句 + and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。例如:
Hurry up, or you’ll be late.
=If you don’t hurry up, you’ll be late.
Study hard and you will pass the exam.
=If you study hard, you will pass the exam.
2)条件状语从句通常由if, unless引导。例如:
What shall we do if it snows tomorrow?
Don’t leave the building unless I tell you to.
3)在条件状语从句里,谓语动词通常用现在时态表示将来的动作或状态。例如:
I’ll help you with your English if am free tomorrow.
He won’t be late unless he is ill.