I can stroke you can stroke he can stroke we can stroke you can stroke they can stroke
V-ing form
I can be stroking you can be stroking he can be stroking we can be stroking you can be stroking they can be stroking
Perfect
I can have stroked you can have stroked he can have stroked we can have stroked you can have stroked they can have stroked
V-ing perfect
I can have been stroking you can have been stroking he can have been stroking we can have been stroking you can have been stroking they can have been stroking
Negation
Simple form
I can't stroke you can't stroke he can't stroke we can't stroke you can't stroke they can't stroke
V-ing form
I can't be stroking you can't be stroking he can't be stroking we can't be stroking you can't be stroking they can't be stroking
Perfect
I can't have stroked you can't have stroked he can't have stroked we can't have stroked you can't have stroked they can't have stroked
V-ing perfect
I can't have been stroking you can't have been stroking he can't have been stroking we can't have been stroking you can't have been stroking they can't have been stroking
Interrogative form
Simple form
can I stroke? can you stroke? can he stroke? can we stroke? can you stroke? can they stroke?
V-ing form
can I be stroking? can you be stroking? can he be stroking? can we be stroking? can you be stroking? can they be stroking?
Perfect
can I have stroked? can you have stroked? can he have stroked? can we have stroked? can you have stroked? can they have stroked?
V-ing perfect
can I have been stroking? can you have been stroking? can he have been stroking? can we have been stroking? can you have been stroking? can they have been stroking?
Interro-negative form
Simple form
can't I stroke? can't you stroke? can't he stroke? can't we stroke? can't you stroke? can't they stroke?
V-ing form
can't I be stroking? can't you be stroking? can't he be stroking? can't we be stroking? can't you be stroking? can't they be stroking?
Perfect
can't I have stroked? can't you have stroked? can't he have stroked? can't we have stroked? can't you have stroked? can't they have stroked?
V-ing perfect
can't I have been stroking? can't you have been stroking? can't he have been stroking? can't we have been stroking? can't you have been stroking? can't they have been stroking?