catch up to的用法和樣例：
例句
- We came up with a group of tourists.
我們趕上了一群旅遊者。 - He ran quickly so as to catch the last bus.
他跑得很快以便趕上那末班車。 - A policeman has the power to arrest a criminal.
警察有權逮捕罪犯。 - His acceptance of bribes led to his arrest.
他接受賄賂，終被逮捕。 - I have a mind to punish you for stealing a cookie.
我有意要處罰你偷餅乾。 - We wonder whom the teacher is going to punish.
我們極想知道老師要處罰誰。
