could clatter
Regular verb: clatter - clattered- clattered

Affirmation 	
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I could clatter
you could clatter
he could clatter
we could clatter
you could clatter
they could clatter 	I could be clattering
you could be clattering
he could be clattering
we could be clattering
you could be clattering
they could be clattering	I could have clattered
you could have clattered
he could have clattered
we could have clattered
you could have clattered
they could have clattered	I could have been clattering
you could have been clattering
he could have been clattering
we could have been clattering
you could have been clattering
they could have been clattering	

Negation 	
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I couldn't clatter
you couldn't clatter
he couldn't clatter
we couldn't clatter
you couldn't clatter
they couldn't clatter 	I couldn't be clattering
you couldn't be clattering
he couldn't be clattering
we couldn't be clattering
you couldn't be clattering
they couldn't be clattering	I couldn't have clattered
you couldn't have clattered
he couldn't have clattered
we couldn't have clattered
you couldn't have clattered
they couldn't have clattered	I couldn't have been clattering
you couldn't have been clattering
he couldn't have been clattering
we couldn't have been clattering
you couldn't have been clattering
they couldn't have been clattering	

Interrogative form 	
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could I clatter?
could you clatter?
could he clatter?
could we clatter?
could you clatter?
could they clatter? 	could I be clattering?
could you be clattering?
could he be clattering?
could we be clattering?
could you be clattering?
could they be clattering? 	could I have clattered?
could you have clattered?
could he have clattered?
could we have clattered?
could you have clattered?
could they have clattered? 	could I have been clattering?
could you have been clattering?
could he have been clattering?
could we have been clattering?
could you have been clattering?
could they have been clattering? 	

Interro-negative form 	
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couldn't I clatter?
couldn't you clatter?
couldn't he clatter?
couldn't we clatter?
couldn't you clatter?
couldn't they clatter? 	couldn't I be clattering?
couldn't you be clattering?
couldn't he be clattering?
couldn't we be clattering?
couldn't you be clattering?
couldn't they be clattering? 	couldn't I have clattered?
couldn't you have clattered?
couldn't he have clattered?
couldn't we have clattered?
couldn't you have clattered?
couldn't they have clattered? 	couldn't I have been clattering?
couldn't you have been clattering?
couldn't he have been clattering?
couldn't we have been clattering?
couldn't you have been clattering?
couldn't they have been clattering?