It's a good idea to recycle things and teach others how to do so

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5. It's a good idea to recycle things and teach others how to do so.
→ We should
6. Naomi started collecting stamps two years ago.
→ Naomi has collected stamps for two years.
7. Because it rains heavily, Adam cannot have a picnic outside.
(SO)
8. You should clean the lake. It's dirty. (BECAUSE)