English verb conjugation
COULD RUMBLE

Regular verb: rumble - rumbled - rumbled

Affirmation

Simple form	V-ing form
I could rumble you could rumble she could rumble we could rumble you could rumble they could rumble	I could be rumbling you could be rumbling she could be rumbling we could be rumbling you could be rumbling they could be rumbling
Perfect	V-ing perfect
I could have rumbled you could have rumbled she could have rumbled we could have rumbled you could have rumbled they could have rumbled	I could have been rumbling you could have been rumbling she could have been rumbling we could have been rumbling you could have been rumbling they could have been rumbling

Negation

Simple form	V-ing form
I couldn't rumble you couldn't rumble she couldn't rumble we couldn't rumble you couldn't rumble they couldn't rumble	I couldn't be rumbling you couldn't be rumbling she couldn't be rumbling we couldn't be rumbling you couldn't be rumbling they couldn't be rumbling
Perfect	V-ing perfect
I couldn't have rumbled you couldn't have rumbled she couldn't have rumbled we couldn't have rumbled you couldn't have rumbled they couldn't have rumbled	I couldn't have been rumbling you couldn't have been rumbling she couldn't have been rumbling we couldn't have been rumbling you couldn't have been rumbling they couldn't have been rumbling

Interrogative form

Simple form	V-ing form
could I rumble? could you rumble? could she rumble? could we rumble? could you rumble? could they rumble?	could I be rumbling? could you be rumbling? could she be rumbling? could we be rumbling? could you be rumbling? could they be rumbling?
Perfect	V-ing perfect
could I have rumbled? could you have rumbled? could she have rumbled? could we have rumbled? could you have rumbled? could they have rumbled?	could I have been rumbling? could you have been rumbling? could she have been rumbling? could we have been rumbling? could you have been rumbling? could they have been rumbling?

Interro-negative form

Simple form	V-ing form
couldn't I rumble? couldn't you rumble? couldn't she rumble? couldn't we rumble? couldn't you rumble? couldn't they rumble?	couldn't I be rumbling? couldn't you be rumbling? couldn't she be rumbling? couldn't we be rumbling? couldn't you be rumbling? couldn't they be rumbling?
Perfect	V-ing perfect
couldn't I have rumbled? couldn't you have rumbled? couldn't she have rumbled? couldn't we have rumbled? couldn't you have rumbled? couldn't they have rumbled?	couldn't I have been rumbling? couldn't you have been rumbling? couldn't she have been rumbling? couldn't we have been rumbling? couldn't you have been rumbling? couldn't they have been rumbling?