I could base you could base he could base we could base you could base they could base
Forma com V-ing
I could be basing you could be basing he could be basing we could be basing you could be basing they could be basing
Perfeito
I could have based you could have based he could have based we could have based you could have based they could have based
Perfeito com V-ing
I could have been basing you could have been basing he could have been basing we could have been basing you could have been basing they could have been basing
Negação
Forma simple
I couldn't base you couldn't base he couldn't base we couldn't base you couldn't base they couldn't base
Forma com V-ing
I couldn't be basing you couldn't be basing he couldn't be basing we couldn't be basing you couldn't be basing they couldn't be basing
Perfeito
I couldn't have based you couldn't have based he couldn't have based we couldn't have based you couldn't have based they couldn't have based
Perfeito com V-ing
I couldn't have been basing you couldn't have been basing he couldn't have been basing we couldn't have been basing you couldn't have been basing they couldn't have been basing
Forma interrogativa
Forma simple
could I base? could you base? could he base? could we base? could you base? could they base?
Forma com V-ing
could I be basing? could you be basing? could he be basing? could we be basing? could you be basing? could they be basing?
Perfeito
could I have based? could you have based? could he have based? could we have based? could you have based? could they have based?
Perfeito com V-ing
could I have been basing? could you have been basing? could he have been basing? could we have been basing? could you have been basing? could they have been basing?
Forma interro-Negação
Forma simple
couldn't I base? couldn't you base? couldn't he base? couldn't we base? couldn't you base? couldn't they base?
Forma com V-ing
couldn't I be basing? couldn't you be basing? couldn't he be basing? couldn't we be basing? couldn't you be basing? couldn't they be basing?
Perfeito
couldn't I have based? couldn't you have based? couldn't he have based? couldn't we have based? couldn't you have based? couldn't they have based?
Perfeito com V-ing
couldn't I have been basing? couldn't you have been basing? couldn't he have been basing? couldn't we have been basing? couldn't you have been basing? couldn't they have been basing?