I could sanction you could sanction he could sanction we could sanction you could sanction they could sanction
V-ing form
I could be sanctioning you could be sanctioning he could be sanctioning we could be sanctioning you could be sanctioning they could be sanctioning
Perfect
I could have sanctioned you could have sanctioned he could have sanctioned we could have sanctioned you could have sanctioned they could have sanctioned
V-ing perfect
I could have been sanctioning you could have been sanctioning he could have been sanctioning we could have been sanctioning you could have been sanctioning they could have been sanctioning
Negation
Simple form
I couldn't sanction you couldn't sanction he couldn't sanction we couldn't sanction you couldn't sanction they couldn't sanction
V-ing form
I couldn't be sanctioning you couldn't be sanctioning he couldn't be sanctioning we couldn't be sanctioning you couldn't be sanctioning they couldn't be sanctioning
Perfect
I couldn't have sanctioned you couldn't have sanctioned he couldn't have sanctioned we couldn't have sanctioned you couldn't have sanctioned they couldn't have sanctioned
V-ing perfect
I couldn't have been sanctioning you couldn't have been sanctioning he 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
could I sanction? could you sanction? could he sanction? could we sanction? could you sanction? could they sanction?
V-ing form
could I be sanctioning? could you be sanctioning? could he be sanctioning? could we be sanctioning? could you be sanctioning? could they be sanctioning?
Perfect
could I have sanctioned? could you have sanctioned? could he have sanctioned? could we have sanctioned? could you have sanctioned? could they have sanctioned?
V-ing perfect
could I have been sanctioning? could you have been sanctioning? could he have been sanctioning? could we have been sanctioning? could you have been sanctioning? could they have been sanctioning?
Interro-negative form
Simple form
couldn't I sanction? couldn't you sanction? couldn't he sanction? couldn't we sanction? couldn't you sanction? couldn't they sanction?
V-ing form
couldn't I be sanctioning? couldn't you be sanctioning? couldn't he be sanctioning? couldn't we be sanctioning? couldn't you be sanctioning? couldn't they be sanctioning?
Perfect
couldn't I have sanctioned? couldn't you have sanctioned? couldn't he have sanctioned? couldn't we have sanctioned? couldn't you have sanctioned? couldn't they have sanctioned?
V-ing perfect
couldn't I have been sanctioning? couldn't you have been sanctioning? couldn't he have been sanctioning? couldn't we have been sanctioning? couldn't you have been sanctioning? couldn't they have been sanctioning?