English verb conjugation
COULD PEBBLE

Regular verb: pebble - pebbled - pebbled

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?