could sanction
Regular verb: sanction - sanctioned- sanctioned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could sanction
you could sanction
she could sanction
we could sanction
you could sanction
they could sanction 	I could be sanctioning
you could be sanctioning
she could be sanctioning
we could be sanctioning
you could be sanctioning
they could be sanctioning	I could have sanctioned
you could have sanctioned
she could have sanctioned
we could have sanctioned
you could have sanctioned
they could have sanctioned	I could have been sanctioning
you could have been sanctioning
she could have been sanctioning
we could have been sanctioning
you could have been sanctioning
they could have been sanctioning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not sanction
you could not sanction
she could not sanction
we could not sanction
you could not sanction
they could not sanction 	I could not be sanctioning
you could not be sanctioning
she could not be sanctioning
we could not be sanctioning
you could not be sanctioning
they could not be sanctioning	I could not have sanctioned
you could not have sanctioned
she could not have sanctioned
we could not have sanctioned
you could not have sanctioned
they could not have sanctioned	I could not have been sanctioning
you could not have been sanctioning
she could not have been sanctioning
we could not have been sanctioning
you could not have been sanctioning
they could not have been sanctioning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I sanction?
could you sanction?
could she sanction?
could we sanction?
could you sanction?
could they sanction? 	could I be sanctioning?
could you be sanctioning?
could she be sanctioning?
could we be sanctioning?
could you be sanctioning?
could they be sanctioning? 	could I have sanctioned?
could you have sanctioned?
could she have sanctioned?
could we have sanctioned?
could you have sanctioned?
could they have sanctioned? 	could I have been sanctioning?
could you have been sanctioning?
could she have been sanctioning?
could we have been sanctioning?
could you have been sanctioning?
could they have been sanctioning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not sanction?
could you not sanction?
could she not sanction?
could we not sanction?
could you not sanction?
could they not sanction? 	could I not be sanctioning?
could you not be sanctioning?
could she not be sanctioning?
could we not be sanctioning?
could you not be sanctioning?
could they not be sanctioning? 	could I not have sanctioned?
could you not have sanctioned?
could she not have sanctioned?
could we not have sanctioned?
could you not have sanctioned?
could they not have sanctioned? 	could I not have been sanctioning?
could you not have been sanctioning?
could she not have been sanctioning?
could we not have been sanctioning?
could you not have been sanctioning?
could they not have been sanctioning?