could pilfer
Regular verb: pilfer - pilfered- pilfered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pilfer
you could pilfer
he could pilfer
we could pilfer
you could pilfer
they could pilfer 	I could be pilfering
you could be pilfering
he could be pilfering
we could be pilfering
you could be pilfering
they could be pilfering	I could have pilfered
you could have pilfered
he could have pilfered
we could have pilfered
you could have pilfered
they could have pilfered	I could have been pilfering
you could have been pilfering
he could have been pilfering
we could have been pilfering
you could have been pilfering
they could have been pilfering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pilfer
you couldn't pilfer
he couldn't pilfer
we couldn't pilfer
you couldn't pilfer
they couldn't pilfer 	I couldn't be pilfering
you couldn't be pilfering
he couldn't be pilfering
we couldn't be pilfering
you couldn't be pilfering
they couldn't be pilfering	I couldn't have pilfered
you couldn't have pilfered
he couldn't have pilfered
we couldn't have pilfered
you couldn't have pilfered
they couldn't have pilfered	I couldn't have been pilfering
you couldn't have been pilfering
he couldn't have been pilfering
we couldn't have been pilfering
you couldn't have been pilfering
they couldn't have been pilfering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pilfer?
could you pilfer?
could he pilfer?
could we pilfer?
could you pilfer?
could they pilfer? 	could I be pilfering?
could you be pilfering?
could he be pilfering?
could we be pilfering?
could you be pilfering?
could they be pilfering? 	could I have pilfered?
could you have pilfered?
could he have pilfered?
could we have pilfered?
could you have pilfered?
could they have pilfered? 	could I have been pilfering?
could you have been pilfering?
could he have been pilfering?
could we have been pilfering?
could you have been pilfering?
could they have been pilfering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pilfer?
couldn't you pilfer?
couldn't he pilfer?
couldn't we pilfer?
couldn't you pilfer?
couldn't they pilfer? 	couldn't I be pilfering?
couldn't you be pilfering?
couldn't he be pilfering?
couldn't we be pilfering?
couldn't you be pilfering?
couldn't they be pilfering? 	couldn't I have pilfered?
couldn't you have pilfered?
couldn't he have pilfered?
couldn't we have pilfered?
couldn't you have pilfered?
couldn't they have pilfered? 	couldn't I have been pilfering?
couldn't you have been pilfering?
couldn't he have been pilfering?
couldn't we have been pilfering?
couldn't you have been pilfering?
couldn't they have been pilfering?