English verb conjugation
COULD PROTRUDE

Regular verb: protrude - protruded - protruded

Affirmation

Simple form	V-ing form
I could protrude you could protrude he could protrude we could protrude you could protrude they could protrude	I could be protruding you could be protruding he could be protruding we could be protruding you could be protruding they could be protruding
Perfect	V-ing perfect
I could have protruded you could have protruded he could have protruded we could have protruded you could have protruded they could have protruded	I could have been protruding you could have been protruding he could have been protruding we could have been protruding you could have been protruding they could have been protruding

Negation

Simple form	V-ing form
I couldn't protrude you couldn't protrude he couldn't protrude we couldn't protrude you couldn't protrude they couldn't protrude	I couldn't be protruding you couldn't be protruding he couldn't be protruding we couldn't be protruding you couldn't be protruding they couldn't be protruding
Perfect	V-ing perfect
I couldn't have protruded you couldn't have protruded he couldn't have protruded we couldn't have protruded you couldn't have protruded they couldn't have protruded	I couldn't have been protruding you couldn't have been protruding he couldn't have been protruding we couldn't have been protruding you couldn't have been protruding they couldn't have been protruding

Interrogative form

Simple form	V-ing form
could I protrude? could you protrude? could he protrude? could we protrude? could you protrude? could they protrude?	could I be protruding? could you be protruding? could he be protruding? could we be protruding? could you be protruding? could they be protruding?
Perfect	V-ing perfect
could I have protruded? could you have protruded? could he have protruded? could we have protruded? could you have protruded? could they have protruded?	could I have been protruding? could you have been protruding? could he have been protruding? could we have been protruding? could you have been protruding? could they have been protruding?

Interro-negative form

Simple form	V-ing form
couldn't I protrude? couldn't you protrude? couldn't he protrude? couldn't we protrude? couldn't you protrude? couldn't they protrude?	couldn't I be protruding? couldn't you be protruding? couldn't he be protruding? couldn't we be protruding? couldn't you be protruding? couldn't they be protruding?
Perfect	V-ing perfect
couldn't I have protruded? couldn't you have protruded? couldn't he have protruded? couldn't we have protruded? couldn't you have protruded? couldn't they have protruded?	couldn't I have been protruding? couldn't you have been protruding? couldn't he have been protruding? couldn't we have been protruding? couldn't you have been protruding? couldn't they have been protruding?