I can mark you can mark he can mark we can mark you can mark they can mark
Forma com V-ing
I can be marking you can be marking he can be marking we can be marking you can be marking they can be marking
Perfeito
I can have marked you can have marked he can have marked we can have marked you can have marked they can have marked
Perfeito com V-ing
I can have been marking you can have been marking he can have been marking we can have been marking you can have been marking they can have been marking
Negação
Forma simple
I can't mark you can't mark he can't mark we can't mark you can't mark they can't mark
Forma com V-ing
I can't be marking you can't be marking he can't be marking we can't be marking you can't be marking they can't be marking
Perfeito
I can't have marked you can't have marked he can't have marked we can't have marked you can't have marked they can't have marked
Perfeito com V-ing
I can't have been marking you can't have been marking he can't have been marking we can't have been marking you can't have been marking they can't have been marking
Forma interrogativa
Forma simple
can I mark? can you mark? can he mark? can we mark? can you mark? can they mark?
Forma com V-ing
can I be marking? can you be marking? can he be marking? can we be marking? can you be marking? can they be marking?
Perfeito
can I have marked? can you have marked? can he have marked? can we have marked? can you have marked? can they have marked?
Perfeito com V-ing
can I have been marking? can you have been marking? can he have been marking? can we have been marking? can you have been marking? can they have been marking?
Forma interro-Negação
Forma simple
can't I mark? can't you mark? can't he mark? can't we mark? can't you mark? can't they mark?
Forma com V-ing
can't I be marking? can't you be marking? can't he be marking? can't we be marking? can't you be marking? can't they be marking?
Perfeito
can't I have marked? can't you have marked? can't he have marked? can't we have marked? can't you have marked? can't they have marked?
Perfeito com V-ing
can't I have been marking? can't you have been marking? can't he have been marking? can't we have been marking? can't you have been marking? can't they have been marking?