Напишите предложения в прошедшем и будущем времени.

1. I can help you. 2. He can do it himself. 3. We can show you how to experiment with this substance. 4. She can find a good answer. 5. He may stay here for some time. 6. She may take this book home. 7. You may finish your work at 5 o’clock. 8. I must do this exercise. 9. She must wait for him.