could unclamp
Regular verb: unclamp - unclamped- unclamped

Affirmation 	
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I could unclamp
you could unclamp
he could unclamp
we could unclamp
you could unclamp
they could unclamp 	I could be unclamping
you could be unclamping
he could be unclamping
we could be unclamping
you could be unclamping
they could be unclamping	I could have unclamped
you could have unclamped
he could have unclamped
we could have unclamped
you could have unclamped
they could have unclamped	I could have been unclamping
you could have been unclamping
he could have been unclamping
we could have been unclamping
you could have been unclamping
they could have been unclamping	

Negation 	
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I couldn't unclamp
you couldn't unclamp
he couldn't unclamp
we couldn't unclamp
you couldn't unclamp
they couldn't unclamp 	I couldn't be unclamping
you couldn't be unclamping
he couldn't be unclamping
we couldn't be unclamping
you couldn't be unclamping
they couldn't be unclamping	I couldn't have unclamped
you couldn't have unclamped
he couldn't have unclamped
we couldn't have unclamped
you couldn't have unclamped
they couldn't have unclamped	I couldn't have been unclamping
you couldn't have been unclamping
he couldn't have been unclamping
we couldn't have been unclamping
you couldn't have been unclamping
they couldn't have been unclamping	

Interrogative form 	
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could I unclamp?
could you unclamp?
could he unclamp?
could we unclamp?
could you unclamp?
could they unclamp? 	could I be unclamping?
could you be unclamping?
could he be unclamping?
could we be unclamping?
could you be unclamping?
could they be unclamping? 	could I have unclamped?
could you have unclamped?
could he have unclamped?
could we have unclamped?
could you have unclamped?
could they have unclamped? 	could I have been unclamping?
could you have been unclamping?
could he have been unclamping?
could we have been unclamping?
could you have been unclamping?
could they have been unclamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unclamp?
couldn't you unclamp?
couldn't he unclamp?
couldn't we unclamp?
couldn't you unclamp?
couldn't they unclamp? 	couldn't I be unclamping?
couldn't you be unclamping?
couldn't he be unclamping?
couldn't we be unclamping?
couldn't you be unclamping?
couldn't they be unclamping? 	couldn't I have unclamped?
couldn't you have unclamped?
couldn't he have unclamped?
couldn't we have unclamped?
couldn't you have unclamped?
couldn't they have unclamped? 	couldn't I have been unclamping?
couldn't you have been unclamping?
couldn't he have been unclamping?
couldn't we have been unclamping?
couldn't you have been unclamping?
couldn't they have been unclamping?