can acknowledge
Regular verb: acknowledge - acknowledged- acknowledged

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

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

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

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