could appreciate
Regular verb: appreciate - appreciated- appreciated

Affirmation 	
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I could appreciate
you could appreciate
she could appreciate
we could appreciate
you could appreciate
they could appreciate 	I could be appreciating
you could be appreciating
she could be appreciating
we could be appreciating
you could be appreciating
they could be appreciating	I could have appreciated
you could have appreciated
she could have appreciated
we could have appreciated
you could have appreciated
they could have appreciated	I could have been appreciating
you could have been appreciating
she could have been appreciating
we could have been appreciating
you could have been appreciating
they could have been appreciating	

Negation 	
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I could not appreciate
you could not appreciate
she could not appreciate
we could not appreciate
you could not appreciate
they could not appreciate 	I could not be appreciating
you could not be appreciating
she could not be appreciating
we could not be appreciating
you could not be appreciating
they could not be appreciating	I could not have appreciated
you could not have appreciated
she could not have appreciated
we could not have appreciated
you could not have appreciated
they could not have appreciated	I could not have been appreciating
you could not have been appreciating
she could not have been appreciating
we could not have been appreciating
you could not have been appreciating
they could not have been appreciating	

Interrogative form 	
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could I appreciate?
could you appreciate?
could she appreciate?
could we appreciate?
could you appreciate?
could they appreciate? 	could I be appreciating?
could you be appreciating?
could she be appreciating?
could we be appreciating?
could you be appreciating?
could they be appreciating? 	could I have appreciated?
could you have appreciated?
could she have appreciated?
could we have appreciated?
could you have appreciated?
could they have appreciated? 	could I have been appreciating?
could you have been appreciating?
could she have been appreciating?
could we have been appreciating?
could you have been appreciating?
could they have been appreciating? 	

Interro-negative form 	
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could I not appreciate?
could you not appreciate?
could she not appreciate?
could we not appreciate?
could you not appreciate?
could they not appreciate? 	could I not be appreciating?
could you not be appreciating?
could she not be appreciating?
could we not be appreciating?
could you not be appreciating?
could they not be appreciating? 	could I not have appreciated?
could you not have appreciated?
could she not have appreciated?
could we not have appreciated?
could you not have appreciated?
could they not have appreciated? 	could I not have been appreciating?
could you not have been appreciating?
could she not have been appreciating?
could we not have been appreciating?
could you not have been appreciating?
could they not have been appreciating?