关于what would you do if 用法的疑问 请高手赐教!

有一年高考的单项选择考过这样一道题:
what would you do if it____ tomorrow?
A: rain B rains
C will rain D:is raining
答案为B,解析:,it为第三人称单数,所所以答案为B.
然而我的疑惑就是看了what would you do if.....的造句如下:
(1)what would you do if your father didn't approve your plan?
(2)what would you do if you had to leave now?
(3)waht would you do if they didn't trust you ?
这些句子的从句不都是过去时吗? 不是说条件状语从句用一般现在时表将来的吗? 我知道这一定不矛盾,

关于yo-yo what is yo 关于去城市旅游,what would you do?what would you visit? what would you say? would与what do What would you have? What would you like? How would you feel? what would do? What beverage would you like? What size would you like?