I can undress you can undress he can undress we can undress you can undress they can undress
V-ing form
I can be undressing you can be undressing he can be undressing we can be undressing you can be undressing they can be undressing
Perfect
I can have undressed you can have undressed he can have undressed we can have undressed you can have undressed they can have undressed
V-ing perfect
I can have been undressing you can have been undressing he can have been undressing we can have been undressing you can have been undressing they can have been undressing
Negation
Simple form
I can't undress you can't undress he can't undress we can't undress you can't undress they can't undress
V-ing form
I can't be undressing you can't be undressing he can't be undressing we can't be undressing you can't be undressing they can't be undressing
Perfect
I can't have undressed you can't have undressed he can't have undressed we can't have undressed you can't have undressed they can't have undressed
V-ing perfect
I can't have been undressing you can't have been undressing he can't have been undressing we can't have been undressing you can't have been undressing they can't have been undressing
Interrogative form
Simple form
can I undress? can you undress? can he undress? can we undress? can you undress? can they undress?
V-ing form
can I be undressing? can you be undressing? can he be undressing? can we be undressing? can you be undressing? can they be undressing?
Perfect
can I have undressed? can you have undressed? can he have undressed? can we have undressed? can you have undressed? can they have undressed?
V-ing perfect
can I have been undressing? can you have been undressing? can he have been undressing? can we have been undressing? can you have been undressing? can they have been undressing?
Interro-negative form
Simple form
can't I undress? can't you undress? can't he undress? can't we undress? can't you undress? can't they undress?
V-ing form
can't I be undressing? can't you be undressing? can't he be undressing? can't we be undressing? can't you be undressing? can't they be undressing?
Perfect
can't I have undressed? can't you have undressed? can't he have undressed? can't we have undressed? can't you have undressed? can't they have undressed?
V-ing perfect
can't I have been undressing? can't you have been undressing? can't he have been undressing? can't we have been undressing? can't you have been undressing? can't they have been undressing?