could clamber
Regular verb: clamber - clambered- clambered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could clamber
you could clamber
he could clamber
we could clamber
you could clamber
they could clamber 	I could be clambering
you could be clambering
he could be clambering
we could be clambering
you could be clambering
they could be clambering	I could have clambered
you could have clambered
he could have clambered
we could have clambered
you could have clambered
they could have clambered	I could have been clambering
you could have been clambering
he could have been clambering
we could have been clambering
you could have been clambering
they could have been clambering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't clamber
you couldn't clamber
he couldn't clamber
we couldn't clamber
you couldn't clamber
they couldn't clamber 	I couldn't be clambering
you couldn't be clambering
he couldn't be clambering
we couldn't be clambering
you couldn't be clambering
they couldn't be clambering	I couldn't have clambered
you couldn't have clambered
he couldn't have clambered
we couldn't have clambered
you couldn't have clambered
they couldn't have clambered	I couldn't have been clambering
you couldn't have been clambering
he couldn't have been clambering
we couldn't have been clambering
you couldn't have been clambering
they couldn't have been clambering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I clamber?
could you clamber?
could he clamber?
could we clamber?
could you clamber?
could they clamber? 	could I be clambering?
could you be clambering?
could he be clambering?
could we be clambering?
could you be clambering?
could they be clambering? 	could I have clambered?
could you have clambered?
could he have clambered?
could we have clambered?
could you have clambered?
could they have clambered? 	could I have been clambering?
could you have been clambering?
could he have been clambering?
could we have been clambering?
could you have been clambering?
could they have been clambering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I clamber?
couldn't you clamber?
couldn't he clamber?
couldn't we clamber?
couldn't you clamber?
couldn't they clamber? 	couldn't I be clambering?
couldn't you be clambering?
couldn't he be clambering?
couldn't we be clambering?
couldn't you be clambering?
couldn't they be clambering? 	couldn't I have clambered?
couldn't you have clambered?
couldn't he have clambered?
couldn't we have clambered?
couldn't you have clambered?
couldn't they have clambered? 	couldn't I have been clambering?
couldn't you have been clambering?
couldn't he have been clambering?
couldn't we have been clambering?
couldn't you have been clambering?
couldn't they have been clambering?