I could decorate you could decorate she could decorate we could decorate you could decorate they could decorate
V-ing form
I could be decorating you could be decorating she could be decorating we could be decorating you could be decorating they could be decorating
Perfect
I could have decorated you could have decorated she could have decorated we could have decorated you could have decorated they could have decorated
V-ing perfect
I could have been decorating you could have been decorating she could have been decorating we could have been decorating you could have been decorating they could have been decorating
Negation
Simple form
I could not decorate you could not decorate she could not decorate we could not decorate you could not decorate they could not decorate
V-ing form
I could not be decorating you could not be decorating she could not be decorating we could not be decorating you could not be decorating they could not be decorating
Perfect
I could not have decorated you could not have decorated she could not have decorated we could not have decorated you could not have decorated they could not have decorated
V-ing perfect
I could not have been decorating you could not have been decorating she could not have been decorating we could not have been decorating you could not have been decorating they could not have been decorating
Interrogative form
Simple form
could I decorate? could you decorate? could she decorate? could we decorate? could you decorate? could they decorate?
V-ing form
could I be decorating? could you be decorating? could she be decorating? could we be decorating? could you be decorating? could they be decorating?
Perfect
could I have decorated? could you have decorated? could she have decorated? could we have decorated? could you have decorated? could they have decorated?
V-ing perfect
could I have been decorating? could you have been decorating? could she have been decorating? could we have been decorating? could you have been decorating? could they have been decorating?
Interro-negative form
Simple form
could I not decorate? could you not decorate? could she not decorate? could we not decorate? could you not decorate? could they not decorate?
V-ing form
could I not be decorating? could you not be decorating? could she not be decorating? could we not be decorating? could you not be decorating? could they not be decorating?
Perfect
could I not have decorated? could you not have decorated? could she not have decorated? could we not have decorated? could you not have decorated? could they not have decorated?
V-ing perfect
could I not have been decorating? could you not have been decorating? could she not have been decorating? could we not have been decorating? could you not have been decorating? could they not have been decorating?