I could prohibit you could prohibit she could prohibit we could prohibit you could prohibit they could prohibit
V-ing form
I could be prohibiting you could be prohibiting she could be prohibiting we could be prohibiting you could be prohibiting they could be prohibiting
Perfect
I could have prohibited you could have prohibited she could have prohibited we could have prohibited you could have prohibited they could have prohibited
V-ing perfect
I could have been prohibiting you could have been prohibiting she could have been prohibiting we could have been prohibiting you could have been prohibiting they could have been prohibiting
Negation
Simple form
I couldn't prohibit you couldn't prohibit she couldn't prohibit we couldn't prohibit you couldn't prohibit they couldn't prohibit
V-ing form
I couldn't be prohibiting you couldn't be prohibiting she couldn't be prohibiting we couldn't be prohibiting you couldn't be prohibiting they couldn't be prohibiting
Perfect
I couldn't have prohibited you couldn't have prohibited she couldn't have prohibited we couldn't have prohibited you couldn't have prohibited they couldn't have prohibited
V-ing perfect
I couldn't have been prohibiting you couldn't have been prohibiting she couldn't have been prohibiting we couldn't have been prohibiting you couldn't have been prohibiting they couldn't have been prohibiting
Interrogative form
Simple form
could I prohibit? could you prohibit? could she prohibit? could we prohibit? could you prohibit? could they prohibit?
V-ing form
could I be prohibiting? could you be prohibiting? could she be prohibiting? could we be prohibiting? could you be prohibiting? could they be prohibiting?
Perfect
could I have prohibited? could you have prohibited? could she have prohibited? could we have prohibited? could you have prohibited? could they have prohibited?
V-ing perfect
could I have been prohibiting? could you have been prohibiting? could she have been prohibiting? could we have been prohibiting? could you have been prohibiting? could they have been prohibiting?
Interro-negative form
Simple form
couldn't I prohibit? couldn't you prohibit? couldn't she prohibit? couldn't we prohibit? couldn't you prohibit? couldn't they prohibit?
V-ing form
couldn't I be prohibiting? couldn't you be prohibiting? couldn't she be prohibiting? couldn't we be prohibiting? couldn't you be prohibiting? couldn't they be prohibiting?
Perfect
couldn't I have prohibited? couldn't you have prohibited? couldn't she have prohibited? couldn't we have prohibited? couldn't you have prohibited? couldn't they have prohibited?
V-ing perfect
couldn't I have been prohibiting? couldn't you have been prohibiting? couldn't she have been prohibiting? couldn't we have been prohibiting? couldn't you have been prohibiting? couldn't they have been prohibiting?