When would you say 'my 6 friends' or 'my friends of 6' ? Is there any slight difference? Thank you! Thank you for all the answers ! Actually I saw a sentence in an English material as : I need mobiles for my {staff of six} and an Internet connection for the office. Is it right or natural to say 'my staff of six' in that context ? Or is it because 'staff' is a collective noun? and also there's a sentence in my dictionary : The enemy were showing up in {groups of three or four} to turn in their weapons.Ok , I realized {groups of three or four} means {groups of three persons or four persons } , not 'three or four groups' . Just looks alike :)