could thresh
Regular verb: thresh - threshed- threshed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could thresh
you could thresh
she could thresh
we could thresh
you could thresh
they could thresh 	I could be threshing
you could be threshing
she could be threshing
we could be threshing
you could be threshing
they could be threshing	I could have threshed
you could have threshed
she could have threshed
we could have threshed
you could have threshed
they could have threshed	I could have been threshing
you could have been threshing
she could have been threshing
we could have been threshing
you could have been threshing
they could have been threshing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not thresh
you could not thresh
she could not thresh
we could not thresh
you could not thresh
they could not thresh 	I could not be threshing
you could not be threshing
she could not be threshing
we could not be threshing
you could not be threshing
they could not be threshing	I could not have threshed
you could not have threshed
she could not have threshed
we could not have threshed
you could not have threshed
they could not have threshed	I could not have been threshing
you could not have been threshing
she could not have been threshing
we could not have been threshing
you could not have been threshing
they could not have been threshing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I thresh?
could you thresh?
could she thresh?
could we thresh?
could you thresh?
could they thresh? 	could I be threshing?
could you be threshing?
could she be threshing?
could we be threshing?
could you be threshing?
could they be threshing? 	could I have threshed?
could you have threshed?
could she have threshed?
could we have threshed?
could you have threshed?
could they have threshed? 	could I have been threshing?
could you have been threshing?
could she have been threshing?
could we have been threshing?
could you have been threshing?
could they have been threshing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not thresh?
could you not thresh?
could she not thresh?
could we not thresh?
could you not thresh?
could they not thresh? 	could I not be threshing?
could you not be threshing?
could she not be threshing?
could we not be threshing?
could you not be threshing?
could they not be threshing? 	could I not have threshed?
could you not have threshed?
could she not have threshed?
could we not have threshed?
could you not have threshed?
could they not have threshed? 	could I not have been threshing?
could you not have been threshing?
could she not have been threshing?
could we not have been threshing?
could you not have been threshing?
could they not have been threshing?