不加，直接把tonight放在句前或句末就可以，tonight主要用作為副詞、名詞，作副詞時譯為“在今晚，今夜”，作名詞時譯為“今晚，今夜”。例句：I thought we could go out tonight.我本想我們今晚可以出去。

I'd like to book a table for two for 8 o'clock tonight.

我想訂一張今晚8點鐘的二人餐桌。

I'd like to take you out to dinner tonight.

今天晚上我想帶你出去吃飯。

Now for a summary of tonight's main news stories.

現(xiàn)在是今晚主要新聞綜述。

It may freeze tonight, so bring those plants inside.

今夜可能有霜凍，把花草搬進屋來吧。

I think perhaps you've had enough to drink tonight.

我想今晚你已經(jīng)喝得夠多了。

來源：高三網(wǎng)