Упражнение 4: Read the sentences and correct a mistake.

1. If they do not leave soon, they will miss the train. 2. If Kate does not email me now, I will be upset. 3. If you go to bed now, you will not be sleepy tomorrow. 4. If it is not warm, the plants will not grow. 5. If students do not do their homework, their teacher will not be pleased.