I could clatter you could clatter he could clatter we could clatter you could clatter they could clatter
Forma com V-ing
I could be clattering you could be clattering he could be clattering we could be clattering you could be clattering they could be clattering
Perfeito
I could have clattered you could have clattered he could have clattered we could have clattered you could have clattered they could have clattered
Perfeito com V-ing
I could have been clattering you could have been clattering he could have been clattering we could have been clattering you could have been clattering they could have been clattering
Negação
Forma simple
I couldn't clatter you couldn't clatter he couldn't clatter we couldn't clatter you couldn't clatter they couldn't clatter
Forma com V-ing
I couldn't be clattering you couldn't be clattering he couldn't be clattering we couldn't be clattering you couldn't be clattering they couldn't be clattering
Perfeito
I couldn't have clattered you couldn't have clattered he couldn't have clattered we couldn't have clattered you couldn't have clattered they couldn't have clattered
Perfeito com V-ing
I couldn't have been clattering you couldn't have been clattering he couldn't have been clattering we couldn't have been clattering you couldn't have been clattering they couldn't have been clattering
Forma interrogativa
Forma simple
could I clatter? could you clatter? could he clatter? could we clatter? could you clatter? could they clatter?
Forma com V-ing
could I be clattering? could you be clattering? could he be clattering? could we be clattering? could you be clattering? could they be clattering?
Perfeito
could I have clattered? could you have clattered? could he have clattered? could we have clattered? could you have clattered? could they have clattered?
Perfeito com V-ing
could I have been clattering? could you have been clattering? could he have been clattering? could we have been clattering? could you have been clattering? could they have been clattering?
Forma interro-Negação
Forma simple
couldn't I clatter? couldn't you clatter? couldn't he clatter? couldn't we clatter? couldn't you clatter? couldn't they clatter?
Forma com V-ing
couldn't I be clattering? couldn't you be clattering? couldn't he be clattering? couldn't we be clattering? couldn't you be clattering? couldn't they be clattering?
Perfeito
couldn't I have clattered? couldn't you have clattered? couldn't he have clattered? couldn't we have clattered? couldn't you have clattered? couldn't they have clattered?
Perfeito com V-ing
couldn't I have been clattering? couldn't you have been clattering? couldn't he have been clattering? couldn't we have been clattering? couldn't you have been clattering? couldn't they have been clattering?