could quarter
Regular verb: quarter - quartered- quartered

Affirmation 	
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I could quarter
you could quarter
he could quarter
we could quarter
you could quarter
they could quarter 	I could be quartering
you could be quartering
he could be quartering
we could be quartering
you could be quartering
they could be quartering	I could have quartered
you could have quartered
he could have quartered
we could have quartered
you could have quartered
they could have quartered	I could have been quartering
you could have been quartering
he could have been quartering
we could have been quartering
you could have been quartering
they could have been quartering	

Negation 	
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I couldn't quarter
you couldn't quarter
he couldn't quarter
we couldn't quarter
you couldn't quarter
they couldn't quarter 	I couldn't be quartering
you couldn't be quartering
he couldn't be quartering
we couldn't be quartering
you couldn't be quartering
they couldn't be quartering	I couldn't have quartered
you couldn't have quartered
he couldn't have quartered
we couldn't have quartered
you couldn't have quartered
they couldn't have quartered	I couldn't have been quartering
you couldn't have been quartering
he couldn't have been quartering
we couldn't have been quartering
you couldn't have been quartering
they couldn't have been quartering	

Interrogative form 	
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could I quarter?
could you quarter?
could he quarter?
could we quarter?
could you quarter?
could they quarter? 	could I be quartering?
could you be quartering?
could he be quartering?
could we be quartering?
could you be quartering?
could they be quartering? 	could I have quartered?
could you have quartered?
could he have quartered?
could we have quartered?
could you have quartered?
could they have quartered? 	could I have been quartering?
could you have been quartering?
could he have been quartering?
could we have been quartering?
could you have been quartering?
could they have been quartering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I quarter?
couldn't you quarter?
couldn't he quarter?
couldn't we quarter?
couldn't you quarter?
couldn't they quarter? 	couldn't I be quartering?
couldn't you be quartering?
couldn't he be quartering?
couldn't we be quartering?
couldn't you be quartering?
couldn't they be quartering? 	couldn't I have quartered?
couldn't you have quartered?
couldn't he have quartered?
couldn't we have quartered?
couldn't you have quartered?
couldn't they have quartered? 	couldn't I have been quartering?
couldn't you have been quartering?
couldn't he have been quartering?
couldn't we have been quartering?
couldn't you have been quartering?
couldn't they have been quartering?