I can smudge you can smudge he can smudge we can smudge you can smudge they can smudge
V-ing form
I can be smudging you can be smudging he can be smudging we can be smudging you can be smudging they can be smudging
Perfect
I can have smudged you can have smudged he can have smudged we can have smudged you can have smudged they can have smudged
V-ing perfect
I can have been smudging you can have been smudging he can have been smudging we can have been smudging you can have been smudging they can have been smudging
Negation
Simple form
I can't smudge you can't smudge he can't smudge we can't smudge you can't smudge they can't smudge
V-ing form
I can't be smudging you can't be smudging he can't be smudging we can't be smudging you can't be smudging they can't be smudging
Perfect
I can't have smudged you can't have smudged he can't have smudged we can't have smudged you can't have smudged they can't have smudged
V-ing perfect
I can't have been smudging you can't have been smudging he can't have been smudging we can't have been smudging you can't have been smudging they can't have been smudging
Interrogative form
Simple form
can I smudge? can you smudge? can he smudge? can we smudge? can you smudge? can they smudge?
V-ing form
can I be smudging? can you be smudging? can he be smudging? can we be smudging? can you be smudging? can they be smudging?
Perfect
can I have smudged? can you have smudged? can he have smudged? can we have smudged? can you have smudged? can they have smudged?
V-ing perfect
can I have been smudging? can you have been smudging? can he have been smudging? can we have been smudging? can you have been smudging? can they have been smudging?
Interro-negative form
Simple form
can't I smudge? can't you smudge? can't he smudge? can't we smudge? can't you smudge? can't they smudge?
V-ing form
can't I be smudging? can't you be smudging? can't he be smudging? can't we be smudging? can't you be smudging? can't they be smudging?
Perfect
can't I have smudged? can't you have smudged? can't he have smudged? can't we have smudged? can't you have smudged? can't they have smudged?
V-ing perfect
can't I have been smudging? can't you have been smudging? can't he have been smudging? can't we have been smudging? can't you have been smudging? can't they have been smudging?