一旦我找到住的地方，我就会把地址发给你。

___Once I've found somewhere to live I'll send you my address.

记住，一旦你签了合同，就不能取消了。

Remember that you won't be able to cancel the contract ___once you've signed.

一旦我知道具体什么时候能拜访你，我很快就会回信。

I'll write back soon ___once I know exactly when I can visit you.