could contest
Regular verb: contest - contested- contested

Affirmation 	
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I could contest
you could contest
he could contest
we could contest
you could contest
they could contest 	I could be contesting
you could be contesting
he could be contesting
we could be contesting
you could be contesting
they could be contesting	I could have contested
you could have contested
he could have contested
we could have contested
you could have contested
they could have contested	I could have been contesting
you could have been contesting
he could have been contesting
we could have been contesting
you could have been contesting
they could have been contesting	

Negation 	
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I couldn't contest
you couldn't contest
he couldn't contest
we couldn't contest
you couldn't contest
they couldn't contest 	I couldn't be contesting
you couldn't be contesting
he couldn't be contesting
we couldn't be contesting
you couldn't be contesting
they couldn't be contesting	I couldn't have contested
you couldn't have contested
he couldn't have contested
we couldn't have contested
you couldn't have contested
they couldn't have contested	I couldn't have been contesting
you couldn't have been contesting
he couldn't have been contesting
we couldn't have been contesting
you couldn't have been contesting
they couldn't have been contesting	

Interrogative form 	
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could I contest?
could you contest?
could he contest?
could we contest?
could you contest?
could they contest? 	could I be contesting?
could you be contesting?
could he be contesting?
could we be contesting?
could you be contesting?
could they be contesting? 	could I have contested?
could you have contested?
could he have contested?
could we have contested?
could you have contested?
could they have contested? 	could I have been contesting?
could you have been contesting?
could he have been contesting?
could we have been contesting?
could you have been contesting?
could they have been contesting? 	

Interro-negative form 	
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couldn't I contest?
couldn't you contest?
couldn't he contest?
couldn't we contest?
couldn't you contest?
couldn't they contest? 	couldn't I be contesting?
couldn't you be contesting?
couldn't he be contesting?
couldn't we be contesting?
couldn't you be contesting?
couldn't they be contesting? 	couldn't I have contested?
couldn't you have contested?
couldn't he have contested?
couldn't we have contested?
couldn't you have contested?
couldn't they have contested? 	couldn't I have been contesting?
couldn't you have been contesting?
couldn't he have been contesting?
couldn't we have been contesting?
couldn't you have been contesting?
couldn't they have been contesting?