I’ll probably go out tonight.
If I (go) out tonight, I (phone) you.
I didn’t know it was your birthday so I didn’t buy you a present
If I (know) it was your birthday, I (buy) you a present.
Unless we (leave) now, we (miss) the start of the film
The bus wasn’t on time so I was late for school
I (not be) late for school if the bus (be) on time.
“I can’t afford a holiday”
“Yes, I know. But where (you go) if you (can afford) it?
We didn’t read the small print and we signed the contract
If we (read) the small print, we (not sign) the contract.
My room isn’t tidy, so I can’t find things
If my room (be) were tidy, I (be able to) find things.
If you (put) wood into water, it (float) .
I’ m not the President, so I can’t make the reforms
If I (be) the President, I (be able to) make the reforms.
I don’t have a watch, so I don’t know the time
I (know) the time if I (have) a watch.