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

`1. ->` They plan to make this beach a nice clean place again.

`2. ->` The students have to collected old clothes for their charity programme for a week.

`3. ->` Unless I leave now, I'll miss my train.

`4. ->` Students at our school take part in a lot of outdoor activities.

`5. ->` No student in the class is more intelligent than Phuc.

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