"假使⋯⋯，就⋯⋯" (jiáshǐ..., jiù...) is another way to phrase "If..., then..." in Chinese, with this pattern being one of the most formal.

An important note is that this pattern is usually only used in written formal Chinese.

Structure

假使 + Statement + 就 + Result

Examples

假使明天下雨，我就不去上班了。If it rains tomorrow, then I'm not going to work.
假使你同意，我们立马签合同。If you agree, then we should sign the contract riht away.
假使我们能找到更多的赞助，我们就可以帮助更多的孩子。If we find even more sponsors, then we can help even more children.