could acknowledge
Regular verb: acknowledge - acknowledged- acknowledged

Affirmation 	
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I could acknowledge
you could acknowledge
she could acknowledge
we could acknowledge
you could acknowledge
they could acknowledge 	I could be acknowledging
you could be acknowledging
she could be acknowledging
we could be acknowledging
you could be acknowledging
they could be acknowledging	I could have acknowledged
you could have acknowledged
she could have acknowledged
we could have acknowledged
you could have acknowledged
they could have acknowledged	I could have been acknowledging
you could have been acknowledging
she could have been acknowledging
we could have been acknowledging
you could have been acknowledging
they could have been acknowledging	

Negation 	
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I couldn't acknowledge
you couldn't acknowledge
she couldn't acknowledge
we couldn't acknowledge
you couldn't acknowledge
they couldn't acknowledge 	I couldn't be acknowledging
you couldn't be acknowledging
she couldn't be acknowledging
we couldn't be acknowledging
you couldn't be acknowledging
they couldn't be acknowledging	I couldn't have acknowledged
you couldn't have acknowledged
she couldn't have acknowledged
we couldn't have acknowledged
you couldn't have acknowledged
they couldn't have acknowledged	I couldn't have been acknowledging
you couldn't have been acknowledging
she couldn't have been acknowledging
we couldn't have been acknowledging
you couldn't have been acknowledging
they couldn't have been acknowledging	

Interrogative form 	
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could I acknowledge?
could you acknowledge?
could she acknowledge?
could we acknowledge?
could you acknowledge?
could they acknowledge? 	could I be acknowledging?
could you be acknowledging?
could she be acknowledging?
could we be acknowledging?
could you be acknowledging?
could they be acknowledging? 	could I have acknowledged?
could you have acknowledged?
could she have acknowledged?
could we have acknowledged?
could you have acknowledged?
could they have acknowledged? 	could I have been acknowledging?
could you have been acknowledging?
could she have been acknowledging?
could we have been acknowledging?
could you have been acknowledging?
could they have been acknowledging? 	

Interro-negative form 	
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couldn't I acknowledge?
couldn't you acknowledge?
couldn't she acknowledge?
couldn't we acknowledge?
couldn't you acknowledge?
couldn't they acknowledge? 	couldn't I be acknowledging?
couldn't you be acknowledging?
couldn't she be acknowledging?
couldn't we be acknowledging?
couldn't you be acknowledging?
couldn't they be acknowledging? 	couldn't I have acknowledged?
couldn't you have acknowledged?
couldn't she have acknowledged?
couldn't we have acknowledged?
couldn't you have acknowledged?
couldn't they have acknowledged? 	couldn't I have been acknowledging?
couldn't you have been acknowledging?
couldn't she have been acknowledging?
couldn't we have been acknowledging?
couldn't you have been acknowledging?
couldn't they have been acknowledging?