I could muzzle you could muzzle he could muzzle we could muzzle you could muzzle they could muzzle
V-ing form
I could be muzzling you could be muzzling he could be muzzling we could be muzzling you could be muzzling they could be muzzling
Perfect
I could have muzzled you could have muzzled he could have muzzled we could have muzzled you could have muzzled they could have muzzled
V-ing perfect
I could have been muzzling you could have been muzzling he could have been muzzling we could have been muzzling you could have been muzzling they could have been muzzling
Negation
Simple form
I couldn't muzzle you couldn't muzzle he couldn't muzzle we couldn't muzzle you couldn't muzzle they couldn't muzzle
V-ing form
I couldn't be muzzling you couldn't be muzzling he couldn't be muzzling we couldn't be muzzling you couldn't be muzzling they couldn't be muzzling
Perfect
I couldn't have muzzled you couldn't have muzzled he couldn't have muzzled we couldn't have muzzled you couldn't have muzzled they couldn't have muzzled
V-ing perfect
I couldn't have been muzzling you couldn't have been muzzling he couldn't have been muzzling we couldn't have been muzzling you couldn't have been muzzling they couldn't have been muzzling
Interrogative form
Simple form
could I muzzle? could you muzzle? could he muzzle? could we muzzle? could you muzzle? could they muzzle?
V-ing form
could I be muzzling? could you be muzzling? could he be muzzling? could we be muzzling? could you be muzzling? could they be muzzling?
Perfect
could I have muzzled? could you have muzzled? could he have muzzled? could we have muzzled? could you have muzzled? could they have muzzled?
V-ing perfect
could I have been muzzling? could you have been muzzling? could he have been muzzling? could we have been muzzling? could you have been muzzling? could they have been muzzling?
Interro-negative form
Simple form
couldn't I muzzle? couldn't you muzzle? couldn't he muzzle? couldn't we muzzle? couldn't you muzzle? couldn't they muzzle?
V-ing form
couldn't I be muzzling? couldn't you be muzzling? couldn't he be muzzling? couldn't we be muzzling? couldn't you be muzzling? couldn't they be muzzling?
Perfect
couldn't I have muzzled? couldn't you have muzzled? couldn't he have muzzled? couldn't we have muzzled? couldn't you have muzzled? couldn't they have muzzled?
V-ing perfect
couldn't I have been muzzling? couldn't you have been muzzling? couldn't he have been muzzling? couldn't we have been muzzling? couldn't you have been muzzling? couldn't they have been muzzling?