could keep
Irregular verb: keep - kept- kept

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could keep
you could keep
she could keep
we could keep
you could keep
they could keep 	I could be keeping
you could be keeping
she could be keeping
we could be keeping
you could be keeping
they could be keeping	I could have kept
you could have kept
she could have kept
we could have kept
you could have kept
they could have kept	I could have been keeping
you could have been keeping
she could have been keeping
we could have been keeping
you could have been keeping
they could have been keeping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not keep
you could not keep
she could not keep
we could not keep
you could not keep
they could not keep 	I could not be keeping
you could not be keeping
she could not be keeping
we could not be keeping
you could not be keeping
they could not be keeping	I could not have kept
you could not have kept
she could not have kept
we could not have kept
you could not have kept
they could not have kept	I could not have been keeping
you could not have been keeping
she could not have been keeping
we could not have been keeping
you could not have been keeping
they could not have been keeping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I keep?
could you keep?
could she keep?
could we keep?
could you keep?
could they keep? 	could I be keeping?
could you be keeping?
could she be keeping?
could we be keeping?
could you be keeping?
could they be keeping? 	could I have kept?
could you have kept?
could she have kept?
could we have kept?
could you have kept?
could they have kept? 	could I have been keeping?
could you have been keeping?
could she have been keeping?
could we have been keeping?
could you have been keeping?
could they have been keeping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not keep?
could you not keep?
could she not keep?
could we not keep?
could you not keep?
could they not keep? 	could I not be keeping?
could you not be keeping?
could she not be keeping?
could we not be keeping?
could you not be keeping?
could they not be keeping? 	could I not have kept?
could you not have kept?
could she not have kept?
could we not have kept?
could you not have kept?
could they not have kept? 	could I not have been keeping?
could you not have been keeping?
could she not have been keeping?
could we not have been keeping?
could you not have been keeping?
could they not have been keeping?