The time has come to act.

　　采取行動的時機到了。

　　How sad that all his hard work should come to nothing.

　　他的所有辛勤勞動竟全部付諸東流，太讓人傷心了。

　　We can come to an arrangement over the price.

　　我們可以就價格問題達成一項協議。

　　How do you come to be so late?

　　你怎么這么晚？

　　When will they come to a decision?

　　他們何時會作出決定？