1.wake up 唤醒；叫醒

例句：I used to wake up early and get up at 6:30.
我通常醒得早，六点半钟起床。

2.come on 加油，快点

例句：He will come on time even though it rains.
即使下雨,他还是会准时来的。

3.the principal of ...负责人；领导

例句：The principal of his school spoke to me, but there was little I was able to do.
学校的校长给我介绍了他的情况，但我对此却无能为力。

4.It's time to 到...时候了
例句：It' s time to get tough with football hooligans.
现在该对足球迷小流氓采取强硬措施了。