can protrude
Regular verb: protrude - protruded- protruded

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