1. I wonder when they'll be back. 2. You'll know Tom as soon as you see Him. 3. If you meet Lena and Kolya, ask them to hurry. 4. She'll be thrilled to meet you there. 5. If you read in poor light, you will ruin your eyes. 6. I'll break the news to him as soon as he gets here. 7. Stay here until the light turns green. 8. I don't remember when they come back. 9. If he's late, we'll leave without him. 10. The Elevator will not go up until you press the button. 11. If you don't leave right away you'll miss the train. 12. I'll give you this book whenever you want. 13. You will not know English until you start working hard. 14. I don't know when we'll meet again. 15. I'll see you before I leave. 16. As soon as I come home, I will write to you. 17. The plane won't take off until the fog clears. 18. When it gets dark, we'll turn on the lights.
