if you witness the robbery,be sure to tell the police,为什么用wi

因为是虚拟语气
对将来情况的假设
1) If I had enough time,I would certainly go.
2) If you hurried up,you would catch that train.
3) If you studied hard in college,you would find a good job in the future.
1.如果我有足够的时间,我一定会去.
2.如果你快一点,你还会赶上那趟列车.
3.如果你在大学里努力学习,将来你就会找到一份好工作.