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