used to (past) = events or states in the past that no longer happen now
Where did Dillon use to work? Does he work there now?
be used to (past, present and future) = something we are accustomed to, that is part of our life
Are paramedics used to working long hours?
get used to (past, present and future) = something we are becoming accustomed to; it may have seemed strange before, but it's normal now
How did Dylon react when he saw someone in pain. Does he think he could get used to it?