I can exist you can exist he can exist we can exist you can exist they can exist
Forma com V-ing
I can be existing you can be existing he can be existing we can be existing you can be existing they can be existing
Perfeito
I can have existed you can have existed he can have existed we can have existed you can have existed they can have existed
Perfeito com V-ing
I can have been existing you can have been existing he can have been existing we can have been existing you can have been existing they can have been existing
Negação
Forma simple
I can't exist you can't exist he can't exist we can't exist you can't exist they can't exist
Forma com V-ing
I can't be existing you can't be existing he can't be existing we can't be existing you can't be existing they can't be existing
Perfeito
I can't have existed you can't have existed he can't have existed we can't have existed you can't have existed they can't have existed
Perfeito com V-ing
I can't have been existing you can't have been existing he can't have been existing we can't have been existing you can't have been existing they can't have been existing
Forma interrogativa
Forma simple
can I exist? can you exist? can he exist? can we exist? can you exist? can they exist?
Forma com V-ing
can I be existing? can you be existing? can he be existing? can we be existing? can you be existing? can they be existing?
Perfeito
can I have existed? can you have existed? can he have existed? can we have existed? can you have existed? can they have existed?
Perfeito com V-ing
can I have been existing? can you have been existing? can he have been existing? can we have been existing? can you have been existing? can they have been existing?
Forma interro-Negação
Forma simple
can't I exist? can't you exist? can't he exist? can't we exist? can't you exist? can't they exist?
Forma com V-ing
can't I be existing? can't you be existing? can't he be existing? can't we be existing? can't you be existing? can't they be existing?
Perfeito
can't I have existed? can't you have existed? can't he have existed? can't we have existed? can't you have existed? can't they have existed?
Perfeito com V-ing
can't I have been existing? can't you have been existing? can't he have been existing? can't we have been existing? can't you have been existing? can't they have been existing?