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 mustn't stagnate
you mustn't stagnate
he mustn't stagnate
we mustn't stagnate
you mustn't stagnate
they mustn't stagnate 	I mustn't be stagnating
you mustn't be stagnating
he mustn't be stagnating
we mustn't be stagnating
you mustn't be stagnating
they mustn't be stagnating	I mustn't have stagnated
you mustn't have stagnated
he mustn't have stagnated
we mustn't have stagnated
you mustn't have stagnated
they mustn't have stagnated	I mustn't have been stagnating
you mustn't have been stagnating
he mustn't have been stagnating
we mustn't have been stagnating
you mustn't have been stagnating
they mustn't 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 	
mustn't I stagnate?
mustn't you stagnate?
mustn't he stagnate?
mustn't we stagnate?
mustn't you stagnate?
mustn't they stagnate? 	mustn't I be stagnating?
mustn't you be stagnating?
mustn't he be stagnating?
mustn't we be stagnating?
mustn't you be stagnating?
mustn't they be stagnating? 	mustn't I have stagnated?
mustn't you have stagnated?
mustn't he have stagnated?
mustn't we have stagnated?
mustn't you have stagnated?
mustn't they have stagnated? 	mustn't I have been stagnating?
mustn't you have been stagnating?
mustn't he have been stagnating?
mustn't we have been stagnating?
mustn't you have been stagnating?
mustn't they have been stagnating?