我需要这份报告在周五前完成。如果是这样的话，我今天就把它做完。

I need this report by Friday. ___If ___so, I'll finish it today.

你会来参加派对吗？如果是的话，请告诉我你想吃什么。

Will you be at the party? ___If ___so, please let me know what food you'd like.

你下个月有时间去旅行吗？如果有的话，你想去哪里？

Do you have time for a trip next month? ___If ___so, where would you like to go?