写出下列句子的同义句,每空一词.

问题描述:

写出下列句子的同义句,每空一词.
We will have a football match tomorrow if it doesn't rain.We will have a football match tomorrow ____ _____ _____.

We will have a football match tomorrow if it doesn't rain. 
We will have a football match tomorrow 【unless it rains】.