I could decussate you could decussate he could decussate we could decussate you could decussate they could decussate
V-ing form
I could be decussating you could be decussating he could be decussating we could be decussating you could be decussating they could be decussating
Perfect
I could have decussated you could have decussated he could have decussated we could have decussated you could have decussated they could have decussated
V-ing perfect
I could have been decussating you could have been decussating he could have been decussating we could have been decussating you could have been decussating they could have been decussating
Negation
Simple form
I could not decussate you could not decussate he could not decussate we could not decussate you could not decussate they could not decussate
V-ing form
I could not be decussating you could not be decussating he could not be decussating we could not be decussating you could not be decussating they could not be decussating
Perfect
I could not have decussated you could not have decussated he could not have decussated we could not have decussated you could not have decussated they could not have decussated
V-ing perfect
I could not have been decussating you could not have been decussating he could not have been decussating we could not have been decussating you could not have been decussating they could not have been decussating
Interrogative form
Simple form
could I decussate? could you decussate? could he decussate? could we decussate? could you decussate? could they decussate?
V-ing form
could I be decussating? could you be decussating? could he be decussating? could we be decussating? could you be decussating? could they be decussating?
Perfect
could I have decussated? could you have decussated? could he have decussated? could we have decussated? could you have decussated? could they have decussated?
V-ing perfect
could I have been decussating? could you have been decussating? could he have been decussating? could we have been decussating? could you have been decussating? could they have been decussating?
Interro-negative form
Simple form
could I not decussate? could you not decussate? could he not decussate? could we not decussate? could you not decussate? could they not decussate?
V-ing form
could I not be decussating? could you not be decussating? could he not be decussating? could we not be decussating? could you not be decussating? could they not be decussating?
Perfect
could I not have decussated? could you not have decussated? could he not have decussated? could we not have decussated? could you not have decussated? could they not have decussated?
V-ing perfect
could I not have been decussating? could you not have been decussating? could he not have been decussating? could we not have been decussating? could you not have been decussating? could they not have been decussating?