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