could thrash
Regular verb: thrash - thrashed- thrashed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could thrash
you could thrash
he could thrash
we could thrash
you could thrash
they could thrash 	I could be thrashing
you could be thrashing
he could be thrashing
we could be thrashing
you could be thrashing
they could be thrashing	I could have thrashed
you could have thrashed
he could have thrashed
we could have thrashed
you could have thrashed
they could have thrashed	I could have been thrashing
you could have been thrashing
he could have been thrashing
we could have been thrashing
you could have been thrashing
they could have been thrashing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't thrash
you couldn't thrash
he couldn't thrash
we couldn't thrash
you couldn't thrash
they couldn't thrash 	I couldn't be thrashing
you couldn't be thrashing
he couldn't be thrashing
we couldn't be thrashing
you couldn't be thrashing
they couldn't be thrashing	I couldn't have thrashed
you couldn't have thrashed
he couldn't have thrashed
we couldn't have thrashed
you couldn't have thrashed
they couldn't have thrashed	I couldn't have been thrashing
you couldn't have been thrashing
he couldn't have been thrashing
we couldn't have been thrashing
you couldn't have been thrashing
they couldn't have been thrashing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I thrash?
could you thrash?
could he thrash?
could we thrash?
could you thrash?
could they thrash? 	could I be thrashing?
could you be thrashing?
could he be thrashing?
could we be thrashing?
could you be thrashing?
could they be thrashing? 	could I have thrashed?
could you have thrashed?
could he have thrashed?
could we have thrashed?
could you have thrashed?
could they have thrashed? 	could I have been thrashing?
could you have been thrashing?
could he have been thrashing?
could we have been thrashing?
could you have been thrashing?
could they have been thrashing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I thrash?
couldn't you thrash?
couldn't he thrash?
couldn't we thrash?
couldn't you thrash?
couldn't they thrash? 	couldn't I be thrashing?
couldn't you be thrashing?
couldn't he be thrashing?
couldn't we be thrashing?
couldn't you be thrashing?
couldn't they be thrashing? 	couldn't I have thrashed?
couldn't you have thrashed?
couldn't he have thrashed?
couldn't we have thrashed?
couldn't you have thrashed?
couldn't they have thrashed? 	couldn't I have been thrashing?
couldn't you have been thrashing?
couldn't he have been thrashing?
couldn't we have been thrashing?
couldn't you have been thrashing?
couldn't they have been thrashing?