could suction
Regular verb: suction - suctioned- suctioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could suction
you could suction
she could suction
we could suction
you could suction
they could suction 	I could be suctioning
you could be suctioning
she could be suctioning
we could be suctioning
you could be suctioning
they could be suctioning	I could have suctioned
you could have suctioned
she could have suctioned
we could have suctioned
you could have suctioned
they could have suctioned	I could have been suctioning
you could have been suctioning
she could have been suctioning
we could have been suctioning
you could have been suctioning
they could have been suctioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not suction
you could not suction
she could not suction
we could not suction
you could not suction
they could not suction 	I could not be suctioning
you could not be suctioning
she could not be suctioning
we could not be suctioning
you could not be suctioning
they could not be suctioning	I could not have suctioned
you could not have suctioned
she could not have suctioned
we could not have suctioned
you could not have suctioned
they could not have suctioned	I could not have been suctioning
you could not have been suctioning
she could not have been suctioning
we could not have been suctioning
you could not have been suctioning
they could not have been suctioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I suction?
could you suction?
could she suction?
could we suction?
could you suction?
could they suction? 	could I be suctioning?
could you be suctioning?
could she be suctioning?
could we be suctioning?
could you be suctioning?
could they be suctioning? 	could I have suctioned?
could you have suctioned?
could she have suctioned?
could we have suctioned?
could you have suctioned?
could they have suctioned? 	could I have been suctioning?
could you have been suctioning?
could she have been suctioning?
could we have been suctioning?
could you have been suctioning?
could they have been suctioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not suction?
could you not suction?
could she not suction?
could we not suction?
could you not suction?
could they not suction? 	could I not be suctioning?
could you not be suctioning?
could she not be suctioning?
could we not be suctioning?
could you not be suctioning?
could they not be suctioning? 	could I not have suctioned?
could you not have suctioned?
could she not have suctioned?
could we not have suctioned?
could you not have suctioned?
could they not have suctioned? 	could I not have been suctioning?
could you not have been suctioning?
could she not have been suctioning?
could we not have been suctioning?
could you not have been suctioning?
could they not have been suctioning?