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