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