I could join you could join he could join we could join you could join they could join
Forma com V-ing
I could be joining you could be joining he could be joining we could be joining you could be joining they could be joining
Perfeito
I could have joined you could have joined he could have joined we could have joined you could have joined they could have joined
Perfeito com V-ing
I could have been joining you could have been joining he could have been joining we could have been joining you could have been joining they could have been joining
Negação
Forma simple
I could not join you could not join he could not join we could not join you could not join they could not join
Forma com V-ing
I could not be joining you could not be joining he could not be joining we could not be joining you could not be joining they could not be joining
Perfeito
I could not have joined you could not have joined he could not have joined we could not have joined you could not have joined they could not have joined
Perfeito com V-ing
I could not have been joining you could not have been joining he could not have been joining we could not have been joining you could not have been joining they could not have been joining
Forma interrogativa
Forma simple
could I join? could you join? could he join? could we join? could you join? could they join?
Forma com V-ing
could I be joining? could you be joining? could he be joining? could we be joining? could you be joining? could they be joining?
Perfeito
could I have joined? could you have joined? could he have joined? could we have joined? could you have joined? could they have joined?
Perfeito com V-ing
could I have been joining? could you have been joining? could he have been joining? could we have been joining? could you have been joining? could they have been joining?
Forma interro-Negação
Forma simple
could I not join? could you not join? could he not join? could we not join? could you not join? could they not join?
Forma com V-ing
could I not be joining? could you not be joining? could he not be joining? could we not be joining? could you not be joining? could they not be joining?
Perfeito
could I not have joined? could you not have joined? could he not have joined? could we not have joined? could you not have joined? could they not have joined?
Perfeito com V-ing
could I not have been joining? could you not have been joining? could he not have been joining? could we not have been joining? could you not have been joining? could they not have been joining?