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?