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