Упражнение 4. Read the sentences and correct a mistake (исправьте ошибки).

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