I could join you could join she could join we could join you could join they could join
Forma con V-ing
I could be joining you could be joining she could be joining we could be joining you could be joining they could be joining
Perfecto
I could have joined you could have joined she could have joined we could have joined you could have joined they could have joined
Perfecto con V-ing
I could have been joining you could have been joining she could have been joining we could have been joining you could have been joining they could have been joining
Negación
Forma simple
I could not join you could not join she could not join we could not join you could not join they could not join
Forma con V-ing
I could not be joining you could not be joining she could not be joining we could not be joining you could not be joining they could not be joining
Perfecto
I could not have joined you could not have joined she could not have joined we could not have joined you could not have joined they could not have joined
Perfecto con V-ing
I could not have been joining you could not have been joining she 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 she join? could we join? could you join? could they join?
Forma con V-ing
could I be joining? could you be joining? could she be joining? could we be joining? could you be joining? could they be joining?
Perfecto
could I have joined? could you have joined? could she have joined? could we have joined? could you have joined? could they have joined?
Perfecto con V-ing
could I have been joining? could you have been joining? could she have been joining? could we have been joining? could you have been joining? could they have been joining?
Forma interro-negativa
Forma simple
could I not join? could you not join? could she not join? could we not join? could you not join? could they not join?
Forma con V-ing
could I not be joining? could you not be joining? could she not be joining? could we not be joining? could you not be joining? could they not be joining?
Perfecto
could I not have joined? could you not have joined? could she not have joined? could we not have joined? could you not have joined? could they not have joined?
Perfecto con V-ing
could I not have been joining? could you not have been joining? could she not have been joining? could we not have been joining? could you not have been joining? could they not have been joining?