could phone
Regular verb: phone - phoned- phoned

Affirmation 	
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I could phone
you could phone
he could phone
we could phone
you could phone
they could phone 	I could be phoning
you could be phoning
he could be phoning
we could be phoning
you could be phoning
they could be phoning	I could have phoned
you could have phoned
he could have phoned
we could have phoned
you could have phoned
they could have phoned	I could have been phoning
you could have been phoning
he could have been phoning
we could have been phoning
you could have been phoning
they could have been phoning	

Negation 	
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I could not phone
you could not phone
he could not phone
we could not phone
you could not phone
they could not phone 	I could not be phoning
you could not be phoning
he could not be phoning
we could not be phoning
you could not be phoning
they could not be phoning	I could not have phoned
you could not have phoned
he could not have phoned
we could not have phoned
you could not have phoned
they could not have phoned	I could not have been phoning
you could not have been phoning
he could not have been phoning
we could not have been phoning
you could not have been phoning
they could not have been phoning	

Interrogative form 	
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could I phone?
could you phone?
could he phone?
could we phone?
could you phone?
could they phone? 	could I be phoning?
could you be phoning?
could he be phoning?
could we be phoning?
could you be phoning?
could they be phoning? 	could I have phoned?
could you have phoned?
could he have phoned?
could we have phoned?
could you have phoned?
could they have phoned? 	could I have been phoning?
could you have been phoning?
could he have been phoning?
could we have been phoning?
could you have been phoning?
could they have been phoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not phone?
could you not phone?
could he not phone?
could we not phone?
could you not phone?
could they not phone? 	could I not be phoning?
could you not be phoning?
could he not be phoning?
could we not be phoning?
could you not be phoning?
could they not be phoning? 	could I not have phoned?
could you not have phoned?
could he not have phoned?
could we not have phoned?
could you not have phoned?
could they not have phoned? 	could I not have been phoning?
could you not have been phoning?
could he not have been phoning?
could we not have been phoning?
could you not have been phoning?
could they not have been phoning?