要是我们带了地图就好了，现在就不会迷路了。

___If ___only we had taken a map, we wouldn't be lost now.

要是我当时更小心一点就好了。

___If ___only I had been more careful.

要是你早点告诉我就好了，我本来可以帮忙的。

___If ___only you'd told me earlier, I could have helped.