I can sketch you can sketch he can sketch we can sketch you can sketch they can sketch
Forma com V-ing
I can be sketching you can be sketching he can be sketching we can be sketching you can be sketching they can be sketching
Perfeito
I can have sketched you can have sketched he can have sketched we can have sketched you can have sketched they can have sketched
Perfeito com V-ing
I can have been sketching you can have been sketching he can have been sketching we can have been sketching you can have been sketching they can have been sketching
Negação
Forma simple
I can't sketch you can't sketch he can't sketch we can't sketch you can't sketch they can't sketch
Forma com V-ing
I can't be sketching you can't be sketching he can't be sketching we can't be sketching you can't be sketching they can't be sketching
Perfeito
I can't have sketched you can't have sketched he can't have sketched we can't have sketched you can't have sketched they can't have sketched
Perfeito com V-ing
I can't have been sketching you can't have been sketching he can't have been sketching we can't have been sketching you can't have been sketching they can't have been sketching
Forma interrogativa
Forma simple
can I sketch? can you sketch? can he sketch? can we sketch? can you sketch? can they sketch?
Forma com V-ing
can I be sketching? can you be sketching? can he be sketching? can we be sketching? can you be sketching? can they be sketching?
Perfeito
can I have sketched? can you have sketched? can he have sketched? can we have sketched? can you have sketched? can they have sketched?
Perfeito com V-ing
can I have been sketching? can you have been sketching? can he have been sketching? can we have been sketching? can you have been sketching? can they have been sketching?
Forma interro-Negação
Forma simple
can't I sketch? can't you sketch? can't he sketch? can't we sketch? can't you sketch? can't they sketch?
Forma com V-ing
can't I be sketching? can't you be sketching? can't he be sketching? can't we be sketching? can't you be sketching? can't they be sketching?
Perfeito
can't I have sketched? can't you have sketched? can't he have sketched? can't we have sketched? can't you have sketched? can't they have sketched?
Perfeito com V-ing
can't I have been sketching? can't you have been sketching? can't he have been sketching? can't we have been sketching? can't you have been sketching? can't they have been sketching?