The time has come to act.
采取行动的`时机到了。
How sad that all his hard work should come to nothing.
他的所有辛勤劳动竟全部付诸东流，太让人伤心了。
We can come to an arrangement over the price.
我们可以就价格问题达成一项协议。
How do you come to be so late?
你怎么这么晚？
When will they come to a decision?
他们何时会作出决定？