could deter
Regular verb: deter - detered- detered

Affirmation 	
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I could deter
you could deter
he could deter
we could deter
you could deter
they could deter 	I could be detering
you could be detering
he could be detering
we could be detering
you could be detering
they could be detering	I could have detered
you could have detered
he could have detered
we could have detered
you could have detered
they could have detered	I could have been detering
you could have been detering
he could have been detering
we could have been detering
you could have been detering
they could have been detering	

Negation 	
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I couldn't deter
you couldn't deter
he couldn't deter
we couldn't deter
you couldn't deter
they couldn't deter 	I couldn't be detering
you couldn't be detering
he couldn't be detering
we couldn't be detering
you couldn't be detering
they couldn't be detering	I couldn't have detered
you couldn't have detered
he couldn't have detered
we couldn't have detered
you couldn't have detered
they couldn't have detered	I couldn't have been detering
you couldn't have been detering
he couldn't have been detering
we couldn't have been detering
you couldn't have been detering
they couldn't have been detering	

Interrogative form 	
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could I deter?
could you deter?
could he deter?
could we deter?
could you deter?
could they deter? 	could I be detering?
could you be detering?
could he be detering?
could we be detering?
could you be detering?
could they be detering? 	could I have detered?
could you have detered?
could he have detered?
could we have detered?
could you have detered?
could they have detered? 	could I have been detering?
could you have been detering?
could he have been detering?
could we have been detering?
could you have been detering?
could they have been detering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I deter?
couldn't you deter?
couldn't he deter?
couldn't we deter?
couldn't you deter?
couldn't they deter? 	couldn't I be detering?
couldn't you be detering?
couldn't he be detering?
couldn't we be detering?
couldn't you be detering?
couldn't they be detering? 	couldn't I have detered?
couldn't you have detered?
couldn't he have detered?
couldn't we have detered?
couldn't you have detered?
couldn't they have detered? 	couldn't I have been detering?
couldn't you have been detering?
couldn't he have been detering?
couldn't we have been detering?
couldn't you have been detering?
couldn't they have been detering?