should oppugn
Regular verb: oppugn - oppugned- oppugned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd oppugn
you'd oppugn
he'd oppugn
we'd oppugn
you'd oppugn
they'd oppugn 	I'd be oppugning
you'd be oppugning
he'd be oppugning
we'd be oppugning
you'd be oppugning
they'd be oppugning	I should've oppugned
you should've oppugned
he should've oppugned
we should've oppugned
you should've oppugned
they should've oppugned	I should've been oppugning
you should've been oppugning
he should've been oppugning
we should've been oppugning
you should've been oppugning
they should've been oppugning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't oppugn
you shouldn't oppugn
he shouldn't oppugn
we shouldn't oppugn
you shouldn't oppugn
they shouldn't oppugn 	I shouldn't be oppugning
you shouldn't be oppugning
he shouldn't be oppugning
we shouldn't be oppugning
you shouldn't be oppugning
they shouldn't be oppugning	I shouldn't have oppugned
you shouldn't have oppugned
he shouldn't have oppugned
we shouldn't have oppugned
you shouldn't have oppugned
they shouldn't have oppugned	I shouldn't have been oppugning
you shouldn't have been oppugning
he shouldn't have been oppugning
we shouldn't have been oppugning
you shouldn't have been oppugning
they shouldn't have been oppugning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I oppugn?
should you oppugn?
should he oppugn?
should we oppugn?
should you oppugn?
should they oppugn? 	should I be oppugning?
should you be oppugning?
should he be oppugning?
should we be oppugning?
should you be oppugning?
should they be oppugning? 	should I have oppugned?
should you have oppugned?
should he have oppugned?
should we have oppugned?
should you have oppugned?
should they have oppugned? 	should I have been oppugning?
should you have been oppugning?
should he have been oppugning?
should we have been oppugning?
should you have been oppugning?
should they have been oppugning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I oppugn?
shouldn't you oppugn?
shouldn't he oppugn?
shouldn't we oppugn?
shouldn't you oppugn?
shouldn't they oppugn? 	shouldn't I be oppugning?
shouldn't you be oppugning?
shouldn't he be oppugning?
shouldn't we be oppugning?
shouldn't you be oppugning?
shouldn't they be oppugning? 	shouldn't I have oppugned?
shouldn't you have oppugned?
shouldn't he have oppugned?
shouldn't we have oppugned?
shouldn't you have oppugned?
shouldn't they have oppugned? 	shouldn't I have been oppugning?
shouldn't you have been oppugning?
shouldn't he have been oppugning?
shouldn't we have been oppugning?
shouldn't you have been oppugning?
shouldn't they have been oppugning?