tonight是指今天的整个晚上包括深夜，表示“今晚”的含义。this evening是指今天晚上的早些时候，表示“今天傍晚”的含义，this evening表达的意思比tonight在时间上要早一些。
tonight例句
I thought we could go out tonight.
我本想我们今晚可以出去。
I&39;d like to book a table for two for 8 o&39;clock tonight.
我想订一张今晚8点钟的二人餐桌。
I&39;d like to take you out to dinner tonight.
今天晚上我想带你出去吃饭。
Now for a summary of tonight&39;s main news stories.
现在是今晚主要新闻综述。
It may freeze tonight, so bring those plants inside.
今夜可能有霜冻，把花草搬进屋来吧。
this evening例句
Let&39;s go out this evening.
咱们今天晚上出去吧。
You have a point ─ it would be better to wait till this evening.
你说的有道理，还是等到今天晚上比较好。
It&39;s nice to see some new faces here this evening.
今晚在这儿见到一些新面孔真是太好了。
I&39;m having people to dinner this evening.
今晚我在家里宴请客人。
Take extra care on the roads this evening.
今晚在路上要格外小心。
