can oppugn
Regular verb: oppugn - oppugned- oppugned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can oppugn
you can oppugn
he can oppugn
we can oppugn
you can oppugn
they can oppugn 	I can be oppugning
you can be oppugning
he can be oppugning
we can be oppugning
you can be oppugning
they can be oppugning	I can have oppugned
you can have oppugned
he can have oppugned
we can have oppugned
you can have oppugned
they can have oppugned	I can have been oppugning
you can have been oppugning
he can have been oppugning
we can have been oppugning
you can have been oppugning
they can have been oppugning	

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

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

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