can stagnate
Regular verb: stagnate - stagnated- stagnated

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't stagnate
you can't stagnate
he can't stagnate
we can't stagnate
you can't stagnate
they can't stagnate 	I can't be stagnating
you can't be stagnating
he can't be stagnating
we can't be stagnating
you can't be stagnating
they can't be stagnating	I can't have stagnated
you can't have stagnated
he can't have stagnated
we can't have stagnated
you can't have stagnated
they can't have stagnated	I can't have been stagnating
you can't have been stagnating
he can't have been stagnating
we can't have been stagnating
you can't have been stagnating
they can't have been stagnating	

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

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