1. She came here to read a book.
2. We rewarded the children for studying hard.
3. The children came to the kitchen for biscuits.
4. He promised to help.
5. They went to Paris to learn French.
6. I went to the library for the book about London.
- We use the word to: when we are talking about movement, when we use english infinitive verbs and when we are comparing two things.
- We use the word for: when we want to express thanks or gratitude, when we want to talk about a duration of time and when we want to express support and agreement.
Good luck!