could pebble
Regular verb: pebble - pebbled- pebbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pebble
you could pebble
she could pebble
we could pebble
you could pebble
they could pebble 	I could be pebbling
you could be pebbling
she could be pebbling
we could be pebbling
you could be pebbling
they could be pebbling	I could have pebbled
you could have pebbled
she could have pebbled
we could have pebbled
you could have pebbled
they could have pebbled	I could have been pebbling
you could have been pebbling
she could have been pebbling
we could have been pebbling
you could have been pebbling
they could have been pebbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not pebble
you could not pebble
she could not pebble
we could not pebble
you could not pebble
they could not pebble 	I could not be pebbling
you could not be pebbling
she could not be pebbling
we could not be pebbling
you could not be pebbling
they could not be pebbling	I could not have pebbled
you could not have pebbled
she could not have pebbled
we could not have pebbled
you could not have pebbled
they could not have pebbled	I could not have been pebbling
you could not have been pebbling
she could not have been pebbling
we could not have been pebbling
you could not have been pebbling
they could not have been pebbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pebble?
could you pebble?
could she pebble?
could we pebble?
could you pebble?
could they pebble? 	could I be pebbling?
could you be pebbling?
could she be pebbling?
could we be pebbling?
could you be pebbling?
could they be pebbling? 	could I have pebbled?
could you have pebbled?
could she have pebbled?
could we have pebbled?
could you have pebbled?
could they have pebbled? 	could I have been pebbling?
could you have been pebbling?
could she have been pebbling?
could we have been pebbling?
could you have been pebbling?
could they have been pebbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not pebble?
could you not pebble?
could she not pebble?
could we not pebble?
could you not pebble?
could they not pebble? 	could I not be pebbling?
could you not be pebbling?
could she not be pebbling?
could we not be pebbling?
could you not be pebbling?
could they not be pebbling? 	could I not have pebbled?
could you not have pebbled?
could she not have pebbled?
could we not have pebbled?
could you not have pebbled?
could they not have pebbled? 	could I not have been pebbling?
could you not have been pebbling?
could she not have been pebbling?
could we not have been pebbling?
could you not have been pebbling?
could they not have been pebbling?