I could extrude you could extrude he could extrude we could extrude you could extrude they could extrude
V-ing form
I could be extruding you could be extruding he could be extruding we could be extruding you could be extruding they could be extruding
Perfect
I could have extruded you could have extruded he could have extruded we could have extruded you could have extruded they could have extruded
V-ing perfect
I could have been extruding you could have been extruding he could have been extruding we could have been extruding you could have been extruding they could have been extruding
Negation
Simple form
I could not extrude you could not extrude he could not extrude we could not extrude you could not extrude they could not extrude
V-ing form
I could not be extruding you could not be extruding he could not be extruding we could not be extruding you could not be extruding they could not be extruding
Perfect
I could not have extruded you could not have extruded he could not have extruded we could not have extruded you could not have extruded they could not have extruded
V-ing perfect
I could not have been extruding you could not have been extruding he could not have been extruding we could not have been extruding you could not have been extruding they could not have been extruding
Interrogative form
Simple form
could I extrude? could you extrude? could he extrude? could we extrude? could you extrude? could they extrude?
V-ing form
could I be extruding? could you be extruding? could he be extruding? could we be extruding? could you be extruding? could they be extruding?
Perfect
could I have extruded? could you have extruded? could he have extruded? could we have extruded? could you have extruded? could they have extruded?
V-ing perfect
could I have been extruding? could you have been extruding? could he have been extruding? could we have been extruding? could you have been extruding? could they have been extruding?
Interro-negative form
Simple form
could I not extrude? could you not extrude? could he not extrude? could we not extrude? could you not extrude? could they not extrude?
V-ing form
could I not be extruding? could you not be extruding? could he not be extruding? could we not be extruding? could you not be extruding? could they not be extruding?
Perfect
could I not have extruded? could you not have extruded? could he not have extruded? could we not have extruded? could you not have extruded? could they not have extruded?
V-ing perfect
could I not have been extruding? could you not have been extruding? could he not have been extruding? could we not have been extruding? could you not have been extruding? could they not have been extruding?