English verb conjugation
COULD EXTRUDE

Regular verb: extrude - extruded - extruded

Affirmation

Simple form	V-ing form
I could extrude you could extrude she could extrude we could extrude you could extrude they could extrude	I could be extruding you could be extruding she could be extruding we could be extruding you could be extruding they could be extruding
Perfect	V-ing perfect
I could have extruded you could have extruded she could have extruded we could have extruded you could have extruded they could have extruded	I could have been extruding you could have been extruding she could have been extruding we could have been extruding you could have been extruding they could have been extruding

Negation

Simple form	V-ing form
I couldn't extrude you couldn't extrude she couldn't extrude we couldn't extrude you couldn't extrude they couldn't extrude	I couldn't be extruding you couldn't be extruding she couldn't be extruding we couldn't be extruding you couldn't be extruding they couldn't be extruding
Perfect	V-ing perfect
I couldn't have extruded you couldn't have extruded she couldn't have extruded we couldn't have extruded you couldn't have extruded they couldn't have extruded	I couldn't have been extruding you couldn't have been extruding she couldn't have been extruding we couldn't have been extruding you couldn't have been extruding they couldn't have been extruding

Interrogative form

Simple form	V-ing form
could I extrude? could you extrude? could she extrude? could we extrude? could you extrude? could they extrude?	could I be extruding? could you be extruding? could she be extruding? could we be extruding? could you be extruding? could they be extruding?
Perfect	V-ing perfect
could I have extruded? could you have extruded? could she have extruded? could we have extruded? could you have extruded? could they have extruded?	could I have been extruding? could you have been extruding? could she have been extruding? could we have been extruding? could you have been extruding? could they have been extruding?

Interro-negative form

Simple form	V-ing form
couldn't I extrude? couldn't you extrude? couldn't she extrude? couldn't we extrude? couldn't you extrude? couldn't they extrude?	couldn't I be extruding? couldn't you be extruding? couldn't she be extruding? couldn't we be extruding? couldn't you be extruding? couldn't they be extruding?
Perfect	V-ing perfect
couldn't I have extruded? couldn't you have extruded? couldn't she have extruded? couldn't we have extruded? couldn't you have extruded? couldn't they have extruded?	couldn't I have been extruding? couldn't you have been extruding? couldn't she have been extruding? couldn't we have been extruding? couldn't you have been extruding? couldn't they have been extruding?