20. 1.If you mix blue with yellow, you get green.
2."These suitcases are heavy!"
"I will help you, if you'd like."
3. I am having a party on Saturday. Would you like to come?
4. If you will touch that plate, you'll burn yourself.
5. If you don't study, you won't pass your exams.
6. If we cut down the rain forests, the world's climate will change.
7. When we go to Paris next week, we will visit the Louvre.
