could oppugn
Regular verb: oppugn - oppugned- oppugned

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

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

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

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