must stagnate
Regular verb: stagnate - stagnated- stagnated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must stagnate
you must stagnate
he must stagnate
we must stagnate
you must stagnate
they must stagnate 	I must be stagnating
you must be stagnating
he must be stagnating
we must be stagnating
you must be stagnating
they must be stagnating	I must have stagnated
you must have stagnated
he must have stagnated
we must have stagnated
you must have stagnated
they must have stagnated	I must have been stagnating
you must have been stagnating
he must have been stagnating
we must have been stagnating
you must have been stagnating
they must have been stagnating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not stagnate
you must not stagnate
he must not stagnate
we must not stagnate
you must not stagnate
they must not stagnate 	I must not be stagnating
you must not be stagnating
he must not be stagnating
we must not be stagnating
you must not be stagnating
they must not be stagnating	I must not have stagnated
you must not have stagnated
he must not have stagnated
we must not have stagnated
you must not have stagnated
they must not have stagnated	I must not have been stagnating
you must not have been stagnating
he must not have been stagnating
we must not have been stagnating
you must not have been stagnating
they must not have been stagnating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I stagnate?
must you stagnate?
must he stagnate?
must we stagnate?
must you stagnate?
must they stagnate? 	must I be stagnating?
must you be stagnating?
must he be stagnating?
must we be stagnating?
must you be stagnating?
must they be stagnating? 	must I have stagnated?
must you have stagnated?
must he have stagnated?
must we have stagnated?
must you have stagnated?
must they have stagnated? 	must I have been stagnating?
must you have been stagnating?
must he have been stagnating?
must we have been stagnating?
must you have been stagnating?
must they have been stagnating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not stagnate?
must you not stagnate?
must he not stagnate?
must we not stagnate?
must you not stagnate?
must they not stagnate? 	must I not be stagnating?
must you not be stagnating?
must he not be stagnating?
must we not be stagnating?
must you not be stagnating?
must they not be stagnating? 	must I not have stagnated?
must you not have stagnated?
must he not have stagnated?
must we not have stagnated?
must you not have stagnated?
must they not have stagnated? 	must I not have been stagnating?
must you not have been stagnating?
must he not have been stagnating?
must we not have been stagnating?
must you not have been stagnating?
must they not have been stagnating?