could overtax
Regular verb: overtax - overtaxed- overtaxed

Affirmation 	
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I could overtax
you could overtax
she could overtax
we could overtax
you could overtax
they could overtax 	I could be overtaxing
you could be overtaxing
she could be overtaxing
we could be overtaxing
you could be overtaxing
they could be overtaxing	I could have overtaxed
you could have overtaxed
she could have overtaxed
we could have overtaxed
you could have overtaxed
they could have overtaxed	I could have been overtaxing
you could have been overtaxing
she could have been overtaxing
we could have been overtaxing
you could have been overtaxing
they could have been overtaxing	

Negation 	
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I couldn't overtax
you couldn't overtax
she couldn't overtax
we couldn't overtax
you couldn't overtax
they couldn't overtax 	I couldn't be overtaxing
you couldn't be overtaxing
she couldn't be overtaxing
we couldn't be overtaxing
you couldn't be overtaxing
they couldn't be overtaxing	I couldn't have overtaxed
you couldn't have overtaxed
she couldn't have overtaxed
we couldn't have overtaxed
you couldn't have overtaxed
they couldn't have overtaxed	I couldn't have been overtaxing
you couldn't have been overtaxing
she couldn't have been overtaxing
we couldn't have been overtaxing
you couldn't have been overtaxing
they couldn't have been overtaxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overtax?
could you overtax?
could she overtax?
could we overtax?
could you overtax?
could they overtax? 	could I be overtaxing?
could you be overtaxing?
could she be overtaxing?
could we be overtaxing?
could you be overtaxing?
could they be overtaxing? 	could I have overtaxed?
could you have overtaxed?
could she have overtaxed?
could we have overtaxed?
could you have overtaxed?
could they have overtaxed? 	could I have been overtaxing?
could you have been overtaxing?
could she have been overtaxing?
could we have been overtaxing?
could you have been overtaxing?
could they have been overtaxing? 	

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