I am sure (that) we will get lost if we don't have a map.
that可以省略。
我有地图:I have a map
我没有地图:I don't have a map.
楼上怎么都用haven't呢?
I am sure (that) we will get lost if we don't have a map.
that可以省略。
我有地图:I have a map
我没有地图:I don't have a map.
楼上怎么都用haven't呢?