If I (have) _______ time, I (go)_________ to the opera house
If I have time, I will go to the opera house
If the weather (be)__________ cold, I (watch) __________ kabuki at the Kabukiza Theater.
If the weather is cold, I will watch kabuki at the Kabukiza Theater.
I (not, go)__________ to Ueno Park if it (be)____________ freezing.
I will not/won't go to Ueno Park if it is freezing.