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 couldn't decorate you couldn't decorate she couldn't decorate we couldn't decorate you couldn't decorate they couldn't decorate
V-ing form
I couldn't be decorating you couldn't be decorating she couldn't be decorating we couldn't be decorating you couldn't be decorating they couldn't be decorating
Perfect
I couldn't have decorated you couldn't have decorated she couldn't have decorated we couldn't have decorated you couldn't have decorated they couldn't have decorated
V-ing perfect
I couldn't have been decorating you couldn't have been decorating she couldn't have been decorating we couldn't have been decorating you couldn't have been decorating they couldn't 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
couldn't I decorate? couldn't you decorate? couldn't she decorate? couldn't we decorate? couldn't you decorate? couldn't they decorate?
V-ing form
couldn't I be decorating? couldn't you be decorating? couldn't she be decorating? couldn't we be decorating? couldn't you be decorating? couldn't they be decorating?
Perfect
couldn't I have decorated? couldn't you have decorated? couldn't she have decorated? couldn't we have decorated? couldn't you have decorated? couldn't they have decorated?
V-ing perfect
couldn't I have been decorating? couldn't you have been decorating? couldn't she have been decorating? couldn't we have been decorating? couldn't you have been decorating? couldn't they have been decorating?