Составить 4 типа вопросов к каждому из этих 2 предложений? 1.informal emails are sent between friends 2.some of my friends study abroad.

1. Are informal emails sent between friends?
Informal emails are sent between friends,aren't they?
Are informal emails sent between friends or colleagues?
What is sent between friends?

2. Do any of your friends study abroad?
Some of my friends study abroad,don't they?
Do any of your friends or relatives study abroad?
Who studies abroad?

2.1 Do Some of my friends study abroad?2.2 what do Some of my friend ?2.3 where do Some of my friends study?2.4 who study abroad ?