set фразовый глагол

Ответ от Konbanwa[гуру]
17. That morning I set out writing a letter to Jim.
18. The children were excited to set off on a camping trip.
19. I set about to learn Latin but soon understood that I needed help.
20. At six I was busy setting my little sister to read a book.
21. In the morning we’re going to set to gathering mushrooms.
Значения близкие. Возможны варианты.