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