could endamage
Regular verb: endamage - endamaged- endamaged

Affirmation 	
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I could endamage
you could endamage
he could endamage
we could endamage
you could endamage
they could endamage 	I could be endamaging
you could be endamaging
he could be endamaging
we could be endamaging
you could be endamaging
they could be endamaging	I could have endamaged
you could have endamaged
he could have endamaged
we could have endamaged
you could have endamaged
they could have endamaged	I could have been endamaging
you could have been endamaging
he could have been endamaging
we could have been endamaging
you could have been endamaging
they could have been endamaging	

Negation 	
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I couldn't endamage
you couldn't endamage
he couldn't endamage
we couldn't endamage
you couldn't endamage
they couldn't endamage 	I couldn't be endamaging
you couldn't be endamaging
he couldn't be endamaging
we couldn't be endamaging
you couldn't be endamaging
they couldn't be endamaging	I couldn't have endamaged
you couldn't have endamaged
he couldn't have endamaged
we couldn't have endamaged
you couldn't have endamaged
they couldn't have endamaged	I couldn't have been endamaging
you couldn't have been endamaging
he couldn't have been endamaging
we couldn't have been endamaging
you couldn't have been endamaging
they couldn't have been endamaging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I endamage?
could you endamage?
could he endamage?
could we endamage?
could you endamage?
could they endamage? 	could I be endamaging?
could you be endamaging?
could he be endamaging?
could we be endamaging?
could you be endamaging?
could they be endamaging? 	could I have endamaged?
could you have endamaged?
could he have endamaged?
could we have endamaged?
could you have endamaged?
could they have endamaged? 	could I have been endamaging?
could you have been endamaging?
could he have been endamaging?
could we have been endamaging?
could you have been endamaging?
could they have been endamaging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I endamage?
couldn't you endamage?
couldn't he endamage?
couldn't we endamage?
couldn't you endamage?
couldn't they endamage? 	couldn't I be endamaging?
couldn't you be endamaging?
couldn't he be endamaging?
couldn't we be endamaging?
couldn't you be endamaging?
couldn't they be endamaging? 	couldn't I have endamaged?
couldn't you have endamaged?
couldn't he have endamaged?
couldn't we have endamaged?
couldn't you have endamaged?
couldn't they have endamaged? 	couldn't I have been endamaging?
couldn't you have been endamaging?
couldn't he have been endamaging?
couldn't we have been endamaging?
couldn't you have been endamaging?
couldn't they have been endamaging?