Who did you meet? i met who did you meet? i met how can we help you? you how can we help you? you what have you learned? i've learned what have you learned? i've learned нужно дописать

1. I met my friend today.
2 i met a girl.
3. you can take out this box, please
4/ you can clean the blackboard
5 i've learned the english courses
6 i've learned new rules