條件句是由 if , once , as soon as, when 等連接詞所引導的副詞子句,如以現在簡單式表達,被修飾的主要子句要使用未來式的助動詞will.

例:

If we arrive at the cinema late, we will miss the beginning of the film.

例:

I will tell him as soon as I see him.

例:

As soon as we review your credit card, your order will be processed within 12 hours.