could vent
Regular verb: vent - vented- vented

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vent
you could vent
she could vent
we could vent
you could vent
they could vent 	I could be venting
you could be venting
she could be venting
we could be venting
you could be venting
they could be venting	I could have vented
you could have vented
she could have vented
we could have vented
you could have vented
they could have vented	I could have been venting
you could have been venting
she could have been venting
we could have been venting
you could have been venting
they could have been venting	

Negation 	
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I couldn't vent
you couldn't vent
she couldn't vent
we couldn't vent
you couldn't vent
they couldn't vent 	I couldn't be venting
you couldn't be venting
she couldn't be venting
we couldn't be venting
you couldn't be venting
they couldn't be venting	I couldn't have vented
you couldn't have vented
she couldn't have vented
we couldn't have vented
you couldn't have vented
they couldn't have vented	I couldn't have been venting
you couldn't have been venting
she couldn't have been venting
we couldn't have been venting
you couldn't have been venting
they couldn't have been venting	

Interrogative form 	
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could I vent?
could you vent?
could she vent?
could we vent?
could you vent?
could they vent? 	could I be venting?
could you be venting?
could she be venting?
could we be venting?
could you be venting?
could they be venting? 	could I have vented?
could you have vented?
could she have vented?
could we have vented?
could you have vented?
could they have vented? 	could I have been venting?
could you have been venting?
could she have been venting?
could we have been venting?
could you have been venting?
could they have been venting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I vent?
couldn't you vent?
couldn't she vent?
couldn't we vent?
couldn't you vent?
couldn't they vent? 	couldn't I be venting?
couldn't you be venting?
couldn't she be venting?
couldn't we be venting?
couldn't you be venting?
couldn't they be venting? 	couldn't I have vented?
couldn't you have vented?
couldn't she have vented?
couldn't we have vented?
couldn't you have vented?
couldn't they have vented? 	couldn't I have been venting?
couldn't you have been venting?
couldn't she have been venting?
couldn't we have been venting?
couldn't you have been venting?
couldn't they have been venting?