could busy
Regular verb: busy - busied- busied

Affirmation 	
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I could busy
you could busy
she could busy
we could busy
you could busy
they could busy 	I could be busying
you could be busying
she could be busying
we could be busying
you could be busying
they could be busying	I could have busied
you could have busied
she could have busied
we could have busied
you could have busied
they could have busied	I could have been busying
you could have been busying
she could have been busying
we could have been busying
you could have been busying
they could have been busying	

Negation 	
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I could not busy
you could not busy
she could not busy
we could not busy
you could not busy
they could not busy 	I could not be busying
you could not be busying
she could not be busying
we could not be busying
you could not be busying
they could not be busying	I could not have busied
you could not have busied
she could not have busied
we could not have busied
you could not have busied
they could not have busied	I could not have been busying
you could not have been busying
she could not have been busying
we could not have been busying
you could not have been busying
they could not have been busying	

Interrogative form 	
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could I busy?
could you busy?
could she busy?
could we busy?
could you busy?
could they busy? 	could I be busying?
could you be busying?
could she be busying?
could we be busying?
could you be busying?
could they be busying? 	could I have busied?
could you have busied?
could she have busied?
could we have busied?
could you have busied?
could they have busied? 	could I have been busying?
could you have been busying?
could she have been busying?
could we have been busying?
could you have been busying?
could they have been busying? 	

Interro-negative form 	
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could I not busy?
could you not busy?
could she not busy?
could we not busy?
could you not busy?
could they not busy? 	could I not be busying?
could you not be busying?
could she not be busying?
could we not be busying?
could you not be busying?
could they not be busying? 	could I not have busied?
could you not have busied?
could she not have busied?
could we not have busied?
could you not have busied?
could they not have busied? 	could I not have been busying?
could you not have been busying?
could she not have been busying?
could we not have been busying?
could you not have been busying?
could they not have been busying?