can acknowledge
Regular verb: acknowledge - acknowledged- acknowledged

Affirmation 	
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I can acknowledge
you can acknowledge
he can acknowledge
we can acknowledge
you can acknowledge
they can acknowledge 	I can be acknowledging
you can be acknowledging
he can be acknowledging
we can be acknowledging
you can be acknowledging
they can be acknowledging	I can have acknowledged
you can have acknowledged
he 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
he 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 cannot acknowledge
you cannot acknowledge
he cannot acknowledge
we cannot acknowledge
you cannot acknowledge
they cannot acknowledge 	I cannot be acknowledging
you cannot be acknowledging
he cannot be acknowledging
we cannot be acknowledging
you cannot be acknowledging
they cannot be acknowledging	I cannot have acknowledged
you cannot have acknowledged
he cannot have acknowledged
we cannot have acknowledged
you cannot have acknowledged
they cannot have acknowledged	I cannot have been acknowledging
you cannot have been acknowledging
he cannot have been acknowledging
we cannot have been acknowledging
you cannot have been acknowledging
they cannot have been acknowledging	

Interrogative form 	
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can I acknowledge?
can you acknowledge?
can he acknowledge?
can we acknowledge?
can you acknowledge?
can they acknowledge? 	can I be acknowledging?
can you be acknowledging?
can he be acknowledging?
can we be acknowledging?
can you be acknowledging?
can they be acknowledging? 	can I have acknowledged?
can you have acknowledged?
can he 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 he 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 I not acknowledge?
can you not acknowledge?
can he not acknowledge?
can we not acknowledge?
can you not acknowledge?
can they not acknowledge? 	can I not be acknowledging?
can you not be acknowledging?
can he not be acknowledging?
can we not be acknowledging?
can you not be acknowledging?
can they not be acknowledging? 	can I not have acknowledged?
can you not have acknowledged?
can he not have acknowledged?
can we not have acknowledged?
can you not have acknowledged?
can they not have acknowledged? 	can I not have been acknowledging?
can you not have been acknowledging?
can he not have been acknowledging?
can we not have been acknowledging?
can you not have been acknowledging?
can they not have been acknowledging?