1. If you leave milk out of the fridge, it goes off.
2. If you put wood in water, it floats.
3. If you throw a ball up into the air, it falls on the ground..
4. If you mix red and blue, you get purple.
5. If you add two and three, you get five.
1) If Peter (does) lots of exercise, he’ll be fit and healthy.
2) Please call me if you (need) any help.
3) Will Sarah (be) angry if we don’t go to the party?
4) Cathy will be able to go on holiday if she (saves) enough money.
5) Unless it (rains), we’ll go for a walk.
6) If you (work) hard, you may be promoted.
7) Will you (give) me a call if you have time tomorrow?
8) If you don’t do your homework, I (will not let) you watch TV.
9) Mary won’t go to Australia unless I (pays) for her tickets.
10) If he (arrives) on time, we’ll have dinner before we go out.