Molly would be a splendid woman, if only she didn't talk so much!
The evening will be fine, if only we don't have a storm.
You might be of interest to me, if only I had time to waste on you.
If you leave at two, you will be there before dark.
When he is drowning, a man clutches (или will clutch) at any straw.
If only Greg could get some favourable shock, that's what would do it!
You can do it if you try.
You could do it if you tried.
You could have done it if you had tried.
We 'll go if it does not rain.
Fred will come if he has time.
If you take a taxi, you'll be in time.
If Mark has enough money, he will go to the university.
They won't unless you ask them to come
What remains if you subtract 5 from 10?
If you bought a packet of cigarettes costing 3$ and matches
costing 2$, and gave the shopkeeper 10$ note, how much change ought you
to receive?