[jiǎ rú]

Suppose [supposing] it rained, we would still go.
假如下雨的話， 我們還是要去。

If you ask him, he will help you.
假如你向他請求， 他會幫助你。

In case I forget, please remind me of my promise.
假如我忘記了， 請提醒一下我的諾言。