If you don't want to get lost,you'd better ask for the way.那个you后面是不是had,如果是那为什么它要用过去式.

If you don't want to get lost,you'd better ask for the way.那个you后面是不是had,如果是那为什么它要用过去式.
If you don't want to get lost,you'd better ask for the way.那个you后面是不是had,如果是那为什么它要用过去式.

If you don't want to get lost,you'd better ask for the way.那个you后面是不是had,如果是那为什么它要用过去式.
是had,不过那并非真正意义上的过去式,而是固定表达发中的一部分：
had better do
最好做某事