English verb conjugation
SHOULD PROP

Regular verb: prop - propped - propped

Affirmation

Simple form	V-ing form
I'd prop you'd prop he'd prop we'd prop you'd prop they'd prop	I'd be propping you'd be propping he'd be propping we'd be propping you'd be propping they'd be propping
Perfect	V-ing perfect
I should've propped you should've propped he should've propped we should've propped you should've propped they should've propped	I should've been propping you should've been propping he should've been propping we should've been propping you should've been propping they should've been propping

Negation

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

Interrogative form

Simple form	V-ing form
should I prop? should you prop? should he prop? should we prop? should you prop? should they prop?	should I be propping? should you be propping? should he be propping? should we be propping? should you be propping? should they be propping?
Perfect	V-ing perfect
should I have propped? should you have propped? should he have propped? should we have propped? should you have propped? should they have propped?	should I have been propping? should you have been propping? should he have been propping? should we have been propping? should you have been propping? should they have been propping?

Interro-negative form

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