could overthrow
Irregular verb: overthrow - overthrew- overthrown

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overthrow
you could overthrow
she could overthrow
we could overthrow
you could overthrow
they could overthrow 	I could be overthrowing
you could be overthrowing
she could be overthrowing
we could be overthrowing
you could be overthrowing
they could be overthrowing	I could have overthrown
you could have overthrown
she could have overthrown
we could have overthrown
you could have overthrown
they could have overthrown	I could have been overthrowing
you could have been overthrowing
she could have been overthrowing
we could have been overthrowing
you could have been overthrowing
they could have been overthrowing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overthrow
you couldn't overthrow
she couldn't overthrow
we couldn't overthrow
you couldn't overthrow
they couldn't overthrow 	I couldn't be overthrowing
you couldn't be overthrowing
she couldn't be overthrowing
we couldn't be overthrowing
you couldn't be overthrowing
they couldn't be overthrowing	I couldn't have overthrown
you couldn't have overthrown
she couldn't have overthrown
we couldn't have overthrown
you couldn't have overthrown
they couldn't have overthrown	I couldn't have been overthrowing
you couldn't have been overthrowing
she couldn't have been overthrowing
we couldn't have been overthrowing
you couldn't have been overthrowing
they couldn't have been overthrowing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overthrow?
could you overthrow?
could she overthrow?
could we overthrow?
could you overthrow?
could they overthrow? 	could I be overthrowing?
could you be overthrowing?
could she be overthrowing?
could we be overthrowing?
could you be overthrowing?
could they be overthrowing? 	could I have overthrown?
could you have overthrown?
could she have overthrown?
could we have overthrown?
could you have overthrown?
could they have overthrown? 	could I have been overthrowing?
could you have been overthrowing?
could she have been overthrowing?
could we have been overthrowing?
could you have been overthrowing?
could they have been overthrowing? 	

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