如果那么

rú guǒ nǐ fù dān wǒ de fèi yòng nà me wǒ jiù tóng yì qù

如果你负担我的费用，那么我就同意去。

I will agree to go providing (that) you cover my expenses.

rú guǒ tiān qì hǎo nà me wǒ men jiāng dù guò yī gè yú kuài de jià qī

如果天气好，那么我们将度过一个愉快的假期。

Provided we get good weather, it will be a pleasant holiday.