could gulp
Regular verb: gulp - gulped- gulped

Affirmation 	
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I could gulp
you could gulp
she could gulp
we could gulp
you could gulp
they could gulp 	I could be gulping
you could be gulping
she could be gulping
we could be gulping
you could be gulping
they could be gulping	I could have gulped
you could have gulped
she 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
she 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 couldn't gulp
you couldn't gulp
she couldn't gulp
we couldn't gulp
you couldn't gulp
they couldn't gulp 	I couldn't be gulping
you couldn't be gulping
she couldn't be gulping
we couldn't be gulping
you couldn't be gulping
they couldn't be gulping	I couldn't have gulped
you couldn't have gulped
she couldn't have gulped
we couldn't have gulped
you couldn't have gulped
they couldn't have gulped	I couldn't have been gulping
you couldn't have been gulping
she couldn't have been gulping
we couldn't have been gulping
you couldn't have been gulping
they couldn't have been gulping	

Interrogative form 	
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could I gulp?
could you gulp?
could she gulp?
could we gulp?
could you gulp?
could they gulp? 	could I be gulping?
could you be gulping?
could she be gulping?
could we be gulping?
could you be gulping?
could they be gulping? 	could I have gulped?
could you have gulped?
could she 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 she 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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couldn't I gulp?
couldn't you gulp?
couldn't she gulp?
couldn't we gulp?
couldn't you gulp?
couldn't they gulp? 	couldn't I be gulping?
couldn't you be gulping?
couldn't she be gulping?
couldn't we be gulping?
couldn't you be gulping?
couldn't they be gulping? 	couldn't I have gulped?
couldn't you have gulped?
couldn't she have gulped?
couldn't we have gulped?
couldn't you have gulped?
couldn't they have gulped? 	couldn't I have been gulping?
couldn't you have been gulping?
couldn't she have been gulping?
couldn't we have been gulping?
couldn't you have been gulping?
couldn't they have been gulping?