1 If I have time, I'll help you. 2 If I had time, I'd help you. 3 He'll win the election if he's honest. 4. He'd win the election if he was honest. a The speaker thinks that this situation is imaginary or unlikely. b The speaker thinks that this situation is possible
1, 3 - b. The speaker thinks that this situation is possible
2, 4 - a. The speaker thinks that this situation is imaginary or unlikely.