can prop
Regular verb: prop - propped- propped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can prop
you can prop
she can prop
we can prop
you can prop
they can prop 	I can be propping
you can be propping
she can be propping
we can be propping
you can be propping
they can be propping	I can have propped
you can have propped
she can have propped
we can have propped
you can have propped
they can have propped	I can have been propping
you can have been propping
she can have been propping
we can have been propping
you can have been propping
they can have been propping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot prop
you cannot prop
she cannot prop
we cannot prop
you cannot prop
they cannot prop 	I cannot be propping
you cannot be propping
she cannot be propping
we cannot be propping
you cannot be propping
they cannot be propping	I cannot have propped
you cannot have propped
she cannot have propped
we cannot have propped
you cannot have propped
they cannot have propped	I cannot have been propping
you cannot have been propping
she cannot have been propping
we cannot have been propping
you cannot have been propping
they cannot have been propping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I prop?
can you prop?
can she prop?
can we prop?
can you prop?
can they prop? 	can I be propping?
can you be propping?
can she be propping?
can we be propping?
can you be propping?
can they be propping? 	can I have propped?
can you have propped?
can she have propped?
can we have propped?
can you have propped?
can they have propped? 	can I have been propping?
can you have been propping?
can she have been propping?
can we have been propping?
can you have been propping?
can they have been propping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not prop?
can you not prop?
can she not prop?
can we not prop?
can you not prop?
can they not prop? 	can I not be propping?
can you not be propping?
can she not be propping?
can we not be propping?
can you not be propping?
can they not be propping? 	can I not have propped?
can you not have propped?
can she not have propped?
can we not have propped?
can you not have propped?
can they not have propped? 	can I not have been propping?
can you not have been propping?
can she not have been propping?
can we not have been propping?
can you not have been propping?
can they not have been propping?