could prepare
Regular verb: prepare - prepared- prepared

Affirmation 	
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I could prepare
you could prepare
he could prepare
we could prepare
you could prepare
they could prepare 	I could be preparing
you could be preparing
he could be preparing
we could be preparing
you could be preparing
they could be preparing	I could have prepared
you could have prepared
he could have prepared
we could have prepared
you could have prepared
they could have prepared	I could have been preparing
you could have been preparing
he could have been preparing
we could have been preparing
you could have been preparing
they could have been preparing	

Negation 	
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I couldn't prepare
you couldn't prepare
he couldn't prepare
we couldn't prepare
you couldn't prepare
they couldn't prepare 	I couldn't be preparing
you couldn't be preparing
he couldn't be preparing
we couldn't be preparing
you couldn't be preparing
they couldn't be preparing	I couldn't have prepared
you couldn't have prepared
he couldn't have prepared
we couldn't have prepared
you couldn't have prepared
they couldn't have prepared	I couldn't have been preparing
you couldn't have been preparing
he couldn't have been preparing
we couldn't have been preparing
you couldn't have been preparing
they couldn't have been preparing	

Interrogative form 	
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could I prepare?
could you prepare?
could he prepare?
could we prepare?
could you prepare?
could they prepare? 	could I be preparing?
could you be preparing?
could he be preparing?
could we be preparing?
could you be preparing?
could they be preparing? 	could I have prepared?
could you have prepared?
could he have prepared?
could we have prepared?
could you have prepared?
could they have prepared? 	could I have been preparing?
could you have been preparing?
could he have been preparing?
could we have been preparing?
could you have been preparing?
could they have been preparing? 	

Interro-negative form 	
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couldn't I prepare?
couldn't you prepare?
couldn't he prepare?
couldn't we prepare?
couldn't you prepare?
couldn't they prepare? 	couldn't I be preparing?
couldn't you be preparing?
couldn't he be preparing?
couldn't we be preparing?
couldn't you be preparing?
couldn't they be preparing? 	couldn't I have prepared?
couldn't you have prepared?
couldn't he have prepared?
couldn't we have prepared?
couldn't you have prepared?
couldn't they have prepared? 	couldn't I have been preparing?
couldn't you have been preparing?
couldn't he have been preparing?
couldn't we have been preparing?
couldn't you have been preparing?
couldn't they have been preparing?