drag out
To extend or lengthen excessively.
To haul or bring out forcefully or as though with force.
drag on
Be unnecessarily long
drag down
to cause (other people or another person) to suffer the same fate.
drag in
To get into a course of action by forceful means.
drag up
To remind people of something, usually unpleasant, from the past.
To educate reluctant pupils.