I can base you can base he can base we can base you can base they can base
Forma com V-ing
I can be basing you can be basing he can be basing we can be basing you can be basing they can be basing
Perfeito
I can have based you can have based he can have based we can have based you can have based they can have based
Perfeito com V-ing
I can have been basing you can have been basing he can have been basing we can have been basing you can have been basing they can have been basing
Negação
Forma simple
I cannot base you cannot base he cannot base we cannot base you cannot base they cannot base
Forma com V-ing
I cannot be basing you cannot be basing he cannot be basing we cannot be basing you cannot be basing they cannot be basing
Perfeito
I cannot have based you cannot have based he cannot have based we cannot have based you cannot have based they cannot have based
Perfeito com V-ing
I cannot have been basing you cannot have been basing he cannot have been basing we cannot have been basing you cannot have been basing they cannot have been basing
Forma interrogativa
Forma simple
can I base? can you base? can he base? can we base? can you base? can they base?
Forma com V-ing
can I be basing? can you be basing? can he be basing? can we be basing? can you be basing? can they be basing?
Perfeito
can I have based? can you have based? can he have based? can we have based? can you have based? can they have based?
Perfeito com V-ing
can I have been basing? can you have been basing? can he have been basing? can we have been basing? can you have been basing? can they have been basing?
Forma interro-Negação
Forma simple
can I not base? can you not base? can he not base? can we not base? can you not base? can they not base?
Forma com V-ing
can I not be basing? can you not be basing? can he not be basing? can we not be basing? can you not be basing? can they not be basing?
Perfeito
can I not have based? can you not have based? can he not have based? can we not have based? can you not have based? can they not have based?
Perfeito com V-ing
can I not have been basing? can you not have been basing? can he not have been basing? can we not have been basing? can you not have been basing? can they not have been basing?