best friend
/best frend/

classmate
/ˈklɑːsmeɪt/

colleague
/ˈkɒliːg/

get on (well) with
/get ɒn (wel) wɪð/

have a lot in common with
/hæv a lɒt ɪn ˈkɒmən wɪð/

keep in touch with
/kiːp ɪn tʌtʃ wɪð/

neighbour
/ˈneɪbəʳ/

roommate
/ˈrʊmmeɪt/