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