English verb conjugation
COULD PEBBLE

Regular verb: pebble - pebbled - pebbled

Affirmation

Simple form	V-ing form
I could pebble you could pebble he could pebble we could pebble you could pebble they could pebble	I could be pebbling you could be pebbling he 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 he 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 he 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 couldn't pebble you couldn't pebble he couldn't pebble we couldn't pebble you couldn't pebble they couldn't pebble	I couldn't be pebbling you couldn't be pebbling he couldn't be pebbling we couldn't be pebbling you couldn't be pebbling they couldn't be pebbling
Perfect	V-ing perfect
I couldn't have pebbled you couldn't have pebbled he couldn't have pebbled we couldn't have pebbled you couldn't have pebbled they couldn't have pebbled	I couldn't have been pebbling you couldn't have been pebbling he couldn't have been pebbling we couldn't have been pebbling you couldn't have been pebbling they couldn't have been pebbling

Interrogative form

Simple form	V-ing form
could I pebble? could you pebble? could he pebble? could we pebble? could you pebble? could they pebble?	could I be pebbling? could you be pebbling? could he 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 he 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 he 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
couldn't I pebble? couldn't you pebble? couldn't he pebble? couldn't we pebble? couldn't you pebble? couldn't they pebble?	couldn't I be pebbling? couldn't you be pebbling? couldn't he be pebbling? couldn't we be pebbling? couldn't you be pebbling? couldn't they be pebbling?
Perfect	V-ing perfect
couldn't I have pebbled? couldn't you have pebbled? couldn't he have pebbled? couldn't we have pebbled? couldn't you have pebbled? couldn't they have pebbled?	couldn't I have been pebbling? couldn't you have been pebbling? couldn't he have been pebbling? couldn't we have been pebbling? couldn't you have been pebbling? couldn't they have been pebbling?