I could decollate you could decollate she could decollate we could decollate you could decollate they could decollate
V-ing form
I could be decollating you could be decollating she could be decollating we could be decollating you could be decollating they could be decollating
Perfect
I could have decollated you could have decollated she 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 she 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 she 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 she 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 she 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 she 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 she decollate? could we decollate? could you decollate? could they decollate?
V-ing form
could I be decollating? could you be decollating? could she be decollating? could we be decollating? could you be decollating? could they be decollating?
Perfect
could I have decollated? could you have decollated? could she 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 she 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 she 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 she 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 she 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 she have been decollating? couldn't we have been decollating? couldn't you have been decollating? couldn't they have been decollating?