1. They intend to make this beach a clean and beautiful place again.
->They plan to make this beach a clean and beautiful place again.
2. The students started to collect old clothes for their charity programme last week.
->The students have collected old clothes for their charity programme last week.
3. If I don't leave now, I'll miss my train.
->Unless I leave now, I'll miss the train.
4. Students at our school do a lot of outdoor activities.
->Students at our school take part in a lot of outdoor activities.
5. Phuc is the most intelligent student in the class.
->No student in the class is more intelligent than Phuc