I can grade you can grade he can grade we can grade you can grade they can grade
Forma com V-ing
I can be grading you can be grading he can be grading we can be grading you can be grading they can be grading
Perfeito
I can have graded you can have graded he can have graded we can have graded you can have graded they can have graded
Perfeito com V-ing
I can have been grading you can have been grading he can have been grading we can have been grading you can have been grading they can have been grading
Negação
Forma simple
I can't grade you can't grade he can't grade we can't grade you can't grade they can't grade
Forma com V-ing
I can't be grading you can't be grading he can't be grading we can't be grading you can't be grading they can't be grading
Perfeito
I can't have graded you can't have graded he can't have graded we can't have graded you can't have graded they can't have graded
Perfeito com V-ing
I can't have been grading you can't have been grading he can't have been grading we can't have been grading you can't have been grading they can't have been grading
Forma interrogativa
Forma simple
can I grade? can you grade? can he grade? can we grade? can you grade? can they grade?
Forma com V-ing
can I be grading? can you be grading? can he be grading? can we be grading? can you be grading? can they be grading?
Perfeito
can I have graded? can you have graded? can he have graded? can we have graded? can you have graded? can they have graded?
Perfeito com V-ing
can I have been grading? can you have been grading? can he have been grading? can we have been grading? can you have been grading? can they have been grading?
Forma interro-Negação
Forma simple
can't I grade? can't you grade? can't he grade? can't we grade? can't you grade? can't they grade?
Forma com V-ing
can't I be grading? can't you be grading? can't he be grading? can't we be grading? can't you be grading? can't they be grading?
Perfeito
can't I have graded? can't you have graded? can't he have graded? can't we have graded? can't you have graded? can't they have graded?
Perfeito com V-ing
can't I have been grading? can't you have been grading? can't he have been grading? can't we have been grading? can't you have been grading? can't they have been grading?