if i don't know how to swim条件状语从句,后面怎么写?

问题描述:

if i don't know how to swim
条件状语从句,后面怎么写?

If I don't know how to swim, I will go and learn.
It I don't know how to swim, I will be dangerous in the deep water.

If I do not know how to swim,I will try hard to learn it.