要是我们早点出发，就不会堵在路上了。

___If ___only we had left earlier, we wouldn't be stuck in this traffic.

只要经理批准这个计划，我们就能避免很多额外的工作。

___If ___only the manager approves the plan, we can avoid a lot of extra work.

你要是告诉了我地址，我就不会迷路了。

___If ___only you had told me the address, I wouldn't have gotten lost.