could gulp
Regular verb: gulp - gulped- gulped

Affirmation 	
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I could gulp
you could gulp
he could gulp
we could gulp
you could gulp
they could gulp 	I could be gulping
you could be gulping
he could be gulping
we could be gulping
you could be gulping
they could be gulping	I could have gulped
you could have gulped
he could have gulped
we could have gulped
you could have gulped
they could have gulped	I could have been gulping
you could have been gulping
he could have been gulping
we could have been gulping
you could have been gulping
they could have been gulping	

Negation 	
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I could not gulp
you could not gulp
he could not gulp
we could not gulp
you could not gulp
they could not gulp 	I could not be gulping
you could not be gulping
he could not be gulping
we could not be gulping
you could not be gulping
they could not be gulping	I could not have gulped
you could not have gulped
he could not have gulped
we could not have gulped
you could not have gulped
they could not have gulped	I could not have been gulping
you could not have been gulping
he could not have been gulping
we could not have been gulping
you could not have been gulping
they could not have been gulping	

Interrogative form 	
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could I gulp?
could you gulp?
could he gulp?
could we gulp?
could you gulp?
could they gulp? 	could I be gulping?
could you be gulping?
could he be gulping?
could we be gulping?
could you be gulping?
could they be gulping? 	could I have gulped?
could you have gulped?
could he have gulped?
could we have gulped?
could you have gulped?
could they have gulped? 	could I have been gulping?
could you have been gulping?
could he have been gulping?
could we have been gulping?
could you have been gulping?
could they have been gulping? 	

Interro-negative form 	
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could I not gulp?
could you not gulp?
could he not gulp?
could we not gulp?
could you not gulp?
could they not gulp? 	could I not be gulping?
could you not be gulping?
could he not be gulping?
could we not be gulping?
could you not be gulping?
could they not be gulping? 	could I not have gulped?
could you not have gulped?
could he not have gulped?
could we not have gulped?
could you not have gulped?
could they not have gulped? 	could I not have been gulping?
could you not have been gulping?
could he not have been gulping?
could we not have been gulping?
could you not have been gulping?
could they not have been gulping?