1- If you do have any free time, could you give me a ring? SHOULD
--> Should you not have any free time, could you give me a ring ?
2- We won’t go away if the weather is bad. UNLESS
--> Unless the weather is bad,we will go away (Hoặc: we will go away unless the weather is bad )
3- I didn’t have the money, so I didn’t buy a new suit. WOULD
-->If I had had the money,I would have bought a new suit.
4- If you hurry up, you won’t be late. GOING
-->If don't hurry up,you are going to be late.(Hoặc : Hurry up or you are going to be late.)
5- If they offered you the job, would you accept? WERE
-->  Were they to offer the job, would you accept?
6- If you are in London by any chance, come and see me. HAPPEN
-->Should you happen to be in London, come and see me.
7- Without you, I would have given up years ago. BEEN
-->Had it not been for you, I would have given up years ago./If it hadn't been for you,I would have given up years ago.
8- Please take a seat, and I’ll inquire for you. WILL
-->If you take a seat , I'll inquire for you.
9- Don’t take this job if you don’t really want it. UNLESS
-->Unless you really want this job , don't take it.
10- I wasn’t tall enough to reach the shelf. TALLER
--> If I were taller,I could reach the shelf.
11- If the ship sank, what would you do? WERE
-->Were the ship to sink, what would you do?
12- If you should notice what’s on at the cinema, let me know. HAPPEN
-->Should you happen to notice what's on at the cinema, let me know.
13- If you hadn’t encouraged me, I would have given up. BUT
-->But for your encouragement (for me), I would have given up.
14- I don’t have any money, so I can’t lend you any. IF
-->If I had money,I could lend you any.
15- But for Helen, the play would be a flop. WERE
-->Were it not to be Helen, the play would be a flop.