If I ________ very hard, I would have been able to stop smoking.
If you really want to be helpful, then you ____ to tell me the truth.
_____ you able to lend me some money if I promise you that you will get it back very soon?
If I ________ you, I should work very hard so that I could earn more money.
I will try very hard to come and have dinner at your house if I ..... able to.
Will you come to dinner with us if we ________ a babysitter for you?