I could wear you could wear she could wear we could wear you could wear they could wear
V-ing form
I could be wearing you could be wearing she could be wearing we could be wearing you could be wearing they could be wearing
Perfect
I could have worn you could have worn she could have worn we could have worn you could have worn they could have worn
V-ing perfect
I could have been wearing you could have been wearing she could have been wearing we could have been wearing you could have been wearing they could have been wearing
Negation
Simple form
I couldn't wear you couldn't wear she couldn't wear we couldn't wear you couldn't wear they couldn't wear
V-ing form
I couldn't be wearing you couldn't be wearing she couldn't be wearing we couldn't be wearing you couldn't be wearing they couldn't be wearing
Perfect
I couldn't have worn you couldn't have worn she couldn't have worn we couldn't have worn you couldn't have worn they couldn't have worn
V-ing perfect
I couldn't have been wearing you couldn't have been wearing she couldn't have been wearing we couldn't have been wearing you couldn't have been wearing they couldn't have been wearing
Interrogative form
Simple form
could I wear? could you wear? could she wear? could we wear? could you wear? could they wear?
V-ing form
could I be wearing? could you be wearing? could she be wearing? could we be wearing? could you be wearing? could they be wearing?
Perfect
could I have worn? could you have worn? could she have worn? could we have worn? could you have worn? could they have worn?
V-ing perfect
could I have been wearing? could you have been wearing? could she have been wearing? could we have been wearing? could you have been wearing? could they have been wearing?
Interro-negative form
Simple form
couldn't I wear? couldn't you wear? couldn't she wear? couldn't we wear? couldn't you wear? couldn't they wear?
V-ing form
couldn't I be wearing? couldn't you be wearing? couldn't she be wearing? couldn't we be wearing? couldn't you be wearing? couldn't they be wearing?
Perfect
couldn't I have worn? couldn't you have worn? couldn't she have worn? couldn't we have worn? couldn't you have worn? couldn't they have worn?
V-ing perfect
couldn't I have been wearing? couldn't you have been wearing? couldn't she have been wearing? couldn't we have been wearing? couldn't you have been wearing? couldn't they have been wearing?