without

provided

presumably

in case

in the event of

你如果还有什么工作方面的问题就给我打电话。

Call me if you have any problems regarding your work.

如果你还饿的话，还有一份酸奶。

There's a yogurt left if you're still hungry.

他们威胁说，如果不完成工作，就要提起诉讼。

They threatened to sue if the work was not completed.