could join
Verbo regular: join - joined- joined

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could join
you could join
she could join
we could join
you could join
they could join 	I could be joining
you could be joining
she could be joining
we could be joining
you could be joining
they could be joining	I could have joined
you could have joined
she could have joined
we could have joined
you could have joined
they could have joined	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't join
you couldn't join
she couldn't join
we couldn't join
you couldn't join
they couldn't join 	I couldn't be joining
you couldn't be joining
she couldn't be joining
we couldn't be joining
you couldn't be joining
they couldn't be joining	I couldn't have joined
you couldn't have joined
she couldn't have joined
we couldn't have joined
you couldn't have joined
they couldn't have joined	I couldn't have been joining
you couldn't have been joining
she couldn't have been joining
we couldn't have been joining
you couldn't have been joining
they couldn't have been joining	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I join?
could you join?
could she join?
could we join?
could you join?
could they join? 	could I be joining?
could you be joining?
could she be joining?
could we be joining?
could you be joining?
could they be joining? 	could I have joined?
could you have joined?
could she have joined?
could we have joined?
could you have joined?
could they have joined? 	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I join?
couldn't you join?
couldn't she join?
couldn't we join?
couldn't you join?
couldn't they join? 	couldn't I be joining?
couldn't you be joining?
couldn't she be joining?
couldn't we be joining?
couldn't you be joining?
couldn't they be joining? 	couldn't I have joined?
couldn't you have joined?
couldn't she have joined?
couldn't we have joined?
couldn't you have joined?
couldn't they have joined? 	couldn't I have been joining?
couldn't you have been joining?
couldn't she have been joining?
couldn't we have been joining?
couldn't you have been joining?
couldn't they have been joining?