could lunch
Regular verb: lunch - lunched- lunched

Affirmation 	
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I could lunch
you could lunch
she could lunch
we could lunch
you could lunch
they could lunch 	I could be lunching
you could be lunching
she could be lunching
we could be lunching
you could be lunching
they could be lunching	I could have lunched
you could have lunched
she could have lunched
we could have lunched
you could have lunched
they could have lunched	I could have been lunching
you could have been lunching
she could have been lunching
we could have been lunching
you could have been lunching
they could have been lunching	

Negation 	
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I could not lunch
you could not lunch
she could not lunch
we could not lunch
you could not lunch
they could not lunch 	I could not be lunching
you could not be lunching
she could not be lunching
we could not be lunching
you could not be lunching
they could not be lunching	I could not have lunched
you could not have lunched
she could not have lunched
we could not have lunched
you could not have lunched
they could not have lunched	I could not have been lunching
you could not have been lunching
she could not have been lunching
we could not have been lunching
you could not have been lunching
they could not have been lunching	

Interrogative form 	
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could I lunch?
could you lunch?
could she lunch?
could we lunch?
could you lunch?
could they lunch? 	could I be lunching?
could you be lunching?
could she be lunching?
could we be lunching?
could you be lunching?
could they be lunching? 	could I have lunched?
could you have lunched?
could she have lunched?
could we have lunched?
could you have lunched?
could they have lunched? 	could I have been lunching?
could you have been lunching?
could she have been lunching?
could we have been lunching?
could you have been lunching?
could they have been lunching? 	

Interro-negative form 	
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could I not lunch?
could you not lunch?
could she not lunch?
could we not lunch?
could you not lunch?
could they not lunch? 	could I not be lunching?
could you not be lunching?
could she not be lunching?
could we not be lunching?
could you not be lunching?
could they not be lunching? 	could I not have lunched?
could you not have lunched?
could she not have lunched?
could we not have lunched?
could you not have lunched?
could they not have lunched? 	could I not have been lunching?
could you not have been lunching?
could she not have been lunching?
could we not have been lunching?
could you not have been lunching?
could they not have been lunching?