could overbid
Irregular verb: overbid - overbid- overbid

Affirmation 	
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I could overbid
you could overbid
she could overbid
we could overbid
you could overbid
they could overbid 	I could be overbidding
you could be overbidding
she could be overbidding
we could be overbidding
you could be overbidding
they could be overbidding	I could have overbid
you could have overbid
she could have overbid
we could have overbid
you could have overbid
they could have overbid	I could have been overbidding
you could have been overbidding
she could have been overbidding
we could have been overbidding
you could have been overbidding
they could have been overbidding	

Negation 	
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I couldn't overbid
you couldn't overbid
she couldn't overbid
we couldn't overbid
you couldn't overbid
they couldn't overbid 	I couldn't be overbidding
you couldn't be overbidding
she couldn't be overbidding
we couldn't be overbidding
you couldn't be overbidding
they couldn't be overbidding	I couldn't have overbid
you couldn't have overbid
she couldn't have overbid
we couldn't have overbid
you couldn't have overbid
they couldn't have overbid	I couldn't have been overbidding
you couldn't have been overbidding
she couldn't have been overbidding
we couldn't have been overbidding
you couldn't have been overbidding
they couldn't have been overbidding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overbid?
could you overbid?
could she overbid?
could we overbid?
could you overbid?
could they overbid? 	could I be overbidding?
could you be overbidding?
could she be overbidding?
could we be overbidding?
could you be overbidding?
could they be overbidding? 	could I have overbid?
could you have overbid?
could she have overbid?
could we have overbid?
could you have overbid?
could they have overbid? 	could I have been overbidding?
could you have been overbidding?
could she have been overbidding?
could we have been overbidding?
could you have been overbidding?
could they have been overbidding? 	

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