I must lump you must lump she must lump we must lump you must lump they must lump
V-ing form
I must be lumping you must be lumping she must be lumping we must be lumping you must be lumping they must be lumping
Perfect
I must have lumped you must have lumped she must have lumped we must have lumped you must have lumped they must have lumped
V-ing perfect
I must have been lumping you must have been lumping she must have been lumping we must have been lumping you must have been lumping they must have been lumping
Negation
Simple form
I must not lump you must not lump she must not lump we must not lump you must not lump they must not lump
V-ing form
I must not be lumping you must not be lumping she must not be lumping we must not be lumping you must not be lumping they must not be lumping
Perfect
I must not have lumped you must not have lumped she must not have lumped we must not have lumped you must not have lumped they must not have lumped
V-ing perfect
I must not have been lumping you must not have been lumping she must not have been lumping we must not have been lumping you must not have been lumping they must not have been lumping
Interrogative form
Simple form
must I lump? must you lump? must she lump? must we lump? must you lump? must they lump?
V-ing form
must I be lumping? must you be lumping? must she be lumping? must we be lumping? must you be lumping? must they be lumping?
Perfect
must I have lumped? must you have lumped? must she have lumped? must we have lumped? must you have lumped? must they have lumped?
V-ing perfect
must I have been lumping? must you have been lumping? must she have been lumping? must we have been lumping? must you have been lumping? must they have been lumping?
Interro-negative form
Simple form
must I not lump? must you not lump? must she not lump? must we not lump? must you not lump? must they not lump?
V-ing form
must I not be lumping? must you not be lumping? must she not be lumping? must we not be lumping? must you not be lumping? must they not be lumping?
Perfect
must I not have lumped? must you not have lumped? must she not have lumped? must we not have lumped? must you not have lumped? must they not have lumped?
V-ing perfect
must I not have been lumping? must you not have been lumping? must she not have been lumping? must we not have been lumping? must you not have been lumping? must they not have been lumping?