can stifle
Regular verb: stifle - stifled- stifled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can stifle
you can stifle
she can stifle
we can stifle
you can stifle
they can stifle 	I can be stifling
you can be stifling
she can be stifling
we can be stifling
you can be stifling
they can be stifling	I can have stifled
you can have stifled
she can have stifled
we can have stifled
you can have stifled
they can have stifled	I can have been stifling
you can have been stifling
she can have been stifling
we can have been stifling
you can have been stifling
they can have been stifling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot stifle
you cannot stifle
she cannot stifle
we cannot stifle
you cannot stifle
they cannot stifle 	I cannot be stifling
you cannot be stifling
she cannot be stifling
we cannot be stifling
you cannot be stifling
they cannot be stifling	I cannot have stifled
you cannot have stifled
she cannot have stifled
we cannot have stifled
you cannot have stifled
they cannot have stifled	I cannot have been stifling
you cannot have been stifling
she cannot have been stifling
we cannot have been stifling
you cannot have been stifling
they cannot have been stifling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I stifle?
can you stifle?
can she stifle?
can we stifle?
can you stifle?
can they stifle? 	can I be stifling?
can you be stifling?
can she be stifling?
can we be stifling?
can you be stifling?
can they be stifling? 	can I have stifled?
can you have stifled?
can she have stifled?
can we have stifled?
can you have stifled?
can they have stifled? 	can I have been stifling?
can you have been stifling?
can she have been stifling?
can we have been stifling?
can you have been stifling?
can they have been stifling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not stifle?
can you not stifle?
can she not stifle?
can we not stifle?
can you not stifle?
can they not stifle? 	can I not be stifling?
can you not be stifling?
can she not be stifling?
can we not be stifling?
can you not be stifling?
can they not be stifling? 	can I not have stifled?
can you not have stifled?
can she not have stifled?
can we not have stifled?
can you not have stifled?
can they not have stifled? 	can I not have been stifling?
can you not have been stifling?
can she not have been stifling?
can we not have been stifling?
can you not have been stifling?
can they not have been stifling?