祈使句

句式

祈使句 + or + 简单句

祈使句相当于 “if”

Study hard，or you will fall behind the others.
If you don't study hard, you will fall behind the others.
努力学习，否则你就会落后于别人

Take more exercise and you will feel healthy.
If you take more exercise, you will feel healthy.
多锻炼，你就会感觉身体好