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