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 couldn't sanction
you couldn't sanction
she couldn't sanction
we couldn't sanction
you couldn't sanction
they couldn't sanction 	I couldn't be sanctioning
you couldn't be sanctioning
she couldn't be sanctioning
we couldn't be sanctioning
you couldn't be sanctioning
they couldn't be sanctioning	I couldn't have sanctioned
you couldn't have sanctioned
she couldn't have sanctioned
we couldn't have sanctioned
you couldn't have sanctioned
they couldn't have sanctioned	I couldn't have been sanctioning
you couldn't have been sanctioning
she couldn't have been sanctioning
we couldn't have been sanctioning
you couldn't have been sanctioning
they couldn't 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 	
couldn't I sanction?
couldn't you sanction?
couldn't she sanction?
couldn't we sanction?
couldn't you sanction?
couldn't they sanction? 	couldn't I be sanctioning?
couldn't you be sanctioning?
couldn't she be sanctioning?
couldn't we be sanctioning?
couldn't you be sanctioning?
couldn't they be sanctioning? 	couldn't I have sanctioned?
couldn't you have sanctioned?
couldn't she have sanctioned?
couldn't we have sanctioned?
couldn't you have sanctioned?
couldn't they have sanctioned? 	couldn't I have been sanctioning?
couldn't you have been sanctioning?
couldn't she have been sanctioning?
couldn't we have been sanctioning?
couldn't you have been sanctioning?
couldn't they have been sanctioning?