could clamp
Regular verb: clamp - clamped- clamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could clamp
you could clamp
she could clamp
we could clamp
you could clamp
they could clamp 	I could be clamping
you could be clamping
she could be clamping
we could be clamping
you could be clamping
they could be clamping	I could have clamped
you could have clamped
she could have clamped
we could have clamped
you could have clamped
they could have clamped	I could have been clamping
you could have been clamping
she could have been clamping
we could have been clamping
you could have been clamping
they could have been clamping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't clamp
you couldn't clamp
she couldn't clamp
we couldn't clamp
you couldn't clamp
they couldn't clamp 	I couldn't be clamping
you couldn't be clamping
she couldn't be clamping
we couldn't be clamping
you couldn't be clamping
they couldn't be clamping	I couldn't have clamped
you couldn't have clamped
she couldn't have clamped
we couldn't have clamped
you couldn't have clamped
they couldn't have clamped	I couldn't have been clamping
you couldn't have been clamping
she couldn't have been clamping
we couldn't have been clamping
you couldn't have been clamping
they couldn't have been clamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I clamp?
could you clamp?
could she clamp?
could we clamp?
could you clamp?
could they clamp? 	could I be clamping?
could you be clamping?
could she be clamping?
could we be clamping?
could you be clamping?
could they be clamping? 	could I have clamped?
could you have clamped?
could she have clamped?
could we have clamped?
could you have clamped?
could they have clamped? 	could I have been clamping?
could you have been clamping?
could she have been clamping?
could we have been clamping?
could you have been clamping?
could they have been clamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I clamp?
couldn't you clamp?
couldn't she clamp?
couldn't we clamp?
couldn't you clamp?
couldn't they clamp? 	couldn't I be clamping?
couldn't you be clamping?
couldn't she be clamping?
couldn't we be clamping?
couldn't you be clamping?
couldn't they be clamping? 	couldn't I have clamped?
couldn't you have clamped?
couldn't she have clamped?
couldn't we have clamped?
couldn't you have clamped?
couldn't they have clamped? 	couldn't I have been clamping?
couldn't you have been clamping?
couldn't she have been clamping?
couldn't we have been clamping?
couldn't you have been clamping?
couldn't they have been clamping?