在今晚英语的说法为：in this evening或者tonight。
in this evening或者tonight都有在今晚的意思。tonight的意思还有今夜；今晚；今夜。例如：All she has to do is leave the door open when she leaves tonight.她所需要做的只是在今晚离开时不要锁门。
例句
1、他们在今晚的比赛中面临一场恶战。
They face a torrid time in tonight's game.
2、你介意我们在今晚吃饭前讨论明天的议程吗？
Would you mind if we discuss tomorrow's agenda before dinner this evening?
3、我的学期论文要到下星期才交，但是我想赶在别人之前，在今晚完成它。
My term paper isn't due until next week, but I want to be ahead of the game and finish it tonight.
4、如果他们在今晚的决赛中获胜，球队将在全市巡游，接受热情的支持者的欢呼。
If they win the final tonight, the team are going to tour around the city to be cheered by their enthusiastic supporters.
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