English verb conjugation
CAN PROP

Regular verb: prop - propped - propped

Affirmation

Simple form	V-ing form
I can prop you can prop he can prop we can prop you can prop they can prop	I can be propping you can be propping he can be propping we can be propping you can be propping they can be propping
Perfect	V-ing perfect
I can have propped you can have propped he 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 he 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
I can't prop you can't prop he can't prop we can't prop you can't prop they can't prop	I can't be propping you can't be propping he can't be propping we can't be propping you can't be propping they can't be propping
Perfect	V-ing perfect
I can't have propped you can't have propped he can't have propped we can't have propped you can't have propped they can't have propped	I can't have been propping you can't have been propping he can't have been propping we can't have been propping you can't have been propping they can't have been propping

Interrogative form

Simple form	V-ing form
can I prop? can you prop? can he prop? can we prop? can you prop? can they prop?	can I be propping? can you be propping? can he be propping? can we be propping? can you be propping? can they be propping?
Perfect	V-ing perfect
can I have propped? can you have propped? can he 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 he 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
can't I prop? can't you prop? can't he prop? can't we prop? can't you prop? can't they prop?	can't I be propping? can't you be propping? can't he be propping? can't we be propping? can't you be propping? can't they be propping?
Perfect	V-ing perfect
can't I have propped? can't you have propped? can't he have propped? can't we have propped? can't you have propped? can't they have propped?	can't I have been propping? can't you have been propping? can't he have been propping? can't we have been propping? can't you have been propping? can't they have been propping?