could overtire
Regular verb: overtire - overtired- overtired

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overtire
you could overtire
she could overtire
we could overtire
you could overtire
they could overtire 	I could be overtiring
you could be overtiring
she could be overtiring
we could be overtiring
you could be overtiring
they could be overtiring	I could have overtired
you could have overtired
she could have overtired
we could have overtired
you could have overtired
they could have overtired	I could have been overtiring
you could have been overtiring
she could have been overtiring
we could have been overtiring
you could have been overtiring
they could have been overtiring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overtire
you couldn't overtire
she couldn't overtire
we couldn't overtire
you couldn't overtire
they couldn't overtire 	I couldn't be overtiring
you couldn't be overtiring
she couldn't be overtiring
we couldn't be overtiring
you couldn't be overtiring
they couldn't be overtiring	I couldn't have overtired
you couldn't have overtired
she couldn't have overtired
we couldn't have overtired
you couldn't have overtired
they couldn't have overtired	I couldn't have been overtiring
you couldn't have been overtiring
she couldn't have been overtiring
we couldn't have been overtiring
you couldn't have been overtiring
they couldn't have been overtiring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overtire?
could you overtire?
could she overtire?
could we overtire?
could you overtire?
could they overtire? 	could I be overtiring?
could you be overtiring?
could she be overtiring?
could we be overtiring?
could you be overtiring?
could they be overtiring? 	could I have overtired?
could you have overtired?
could she have overtired?
could we have overtired?
could you have overtired?
could they have overtired? 	could I have been overtiring?
could you have been overtiring?
could she have been overtiring?
could we have been overtiring?
could you have been overtiring?
could they have been overtiring? 	

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