I must welcome you must welcome she must welcome we must welcome you must welcome they must welcome
V-ing form
I must be welcoming you must be welcoming she must be welcoming we must be welcoming you must be welcoming they must be welcoming
Perfect
I must have welcomed you must have welcomed she must have welcomed we must have welcomed you must have welcomed they must have welcomed
V-ing perfect
I must have been welcoming you must have been welcoming she must have been welcoming we must have been welcoming you must have been welcoming they must have been welcoming
Negation
Simple form
I must not welcome you must not welcome she must not welcome we must not welcome you must not welcome they must not welcome
V-ing form
I must not be welcoming you must not be welcoming she must not be welcoming we must not be welcoming you must not be welcoming they must not be welcoming
Perfect
I must not have welcomed you must not have welcomed she must not have welcomed we must not have welcomed you must not have welcomed they must not have welcomed
V-ing perfect
I must not have been welcoming you must not have been welcoming she must not have been welcoming we must not have been welcoming you must not have been welcoming they must not have been welcoming
Interrogative form
Simple form
must I welcome? must you welcome? must she welcome? must we welcome? must you welcome? must they welcome?
V-ing form
must I be welcoming? must you be welcoming? must she be welcoming? must we be welcoming? must you be welcoming? must they be welcoming?
Perfect
must I have welcomed? must you have welcomed? must she have welcomed? must we have welcomed? must you have welcomed? must they have welcomed?
V-ing perfect
must I have been welcoming? must you have been welcoming? must she have been welcoming? must we have been welcoming? must you have been welcoming? must they have been welcoming?
Interro-negative form
Simple form
must I not welcome? must you not welcome? must she not welcome? must we not welcome? must you not welcome? must they not welcome?
V-ing form
must I not be welcoming? must you not be welcoming? must she not be welcoming? must we not be welcoming? must you not be welcoming? must they not be welcoming?
Perfect
must I not have welcomed? must you not have welcomed? must she not have welcomed? must we not have welcomed? must you not have welcomed? must they not have welcomed?
V-ing perfect
must I not have been welcoming? must you not have been welcoming? must she not have been welcoming? must we not have been welcoming? must you not have been welcoming? must they not have been welcoming?