I can protrude you can protrude he can protrude we can protrude you can protrude they can protrude
V-ing form
I can be protruding you can be protruding he can be protruding we can be protruding you can be protruding they can be protruding
Perfect
I can have protruded you can have protruded he can have protruded we can have protruded you can have protruded they can have protruded
V-ing perfect
I can have been protruding you can have been protruding he can have been protruding we can have been protruding you can have been protruding they can have been protruding
Negation
Simple form
I can't protrude you can't protrude he can't protrude we can't protrude you can't protrude they can't protrude
V-ing form
I can't be protruding you can't be protruding he can't be protruding we can't be protruding you can't be protruding they can't be protruding
Perfect
I can't have protruded you can't have protruded he can't have protruded we can't have protruded you can't have protruded they can't have protruded
V-ing perfect
I can't have been protruding you can't have been protruding he can't have been protruding we can't have been protruding you can't have been protruding they can't have been protruding
Interrogative form
Simple form
can I protrude? can you protrude? can he protrude? can we protrude? can you protrude? can they protrude?
V-ing form
can I be protruding? can you be protruding? can he be protruding? can we be protruding? can you be protruding? can they be protruding?
Perfect
can I have protruded? can you have protruded? can he have protruded? can we have protruded? can you have protruded? can they have protruded?
V-ing perfect
can I have been protruding? can you have been protruding? can he have been protruding? can we have been protruding? can you have been protruding? can they have been protruding?
Interro-negative form
Simple form
can't I protrude? can't you protrude? can't he protrude? can't we protrude? can't you protrude? can't they protrude?
V-ing form
can't I be protruding? can't you be protruding? can't he be protruding? can't we be protruding? can't you be protruding? can't they be protruding?
Perfect
can't I have protruded? can't you have protruded? can't he have protruded? can't we have protruded? can't you have protruded? can't they have protruded?
V-ing perfect
can't I have been protruding? can't you have been protruding? can't he have been protruding? can't we have been protruding? can't you have been protruding? can't they have been protruding?