English verb conjugation
COULD THRASH

Regular verb: thrash - thrashed - thrashed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I could not thrash you could not thrash he could not thrash we could not thrash you could not thrash they could not thrash	I could not be thrashing you could not be thrashing he could not be thrashing we could not be thrashing you could not be thrashing they could not be thrashing
Perfect	V-ing perfect
I could not have thrashed you could not have thrashed he could not have thrashed we could not have thrashed you could not have thrashed they could not have thrashed	I could not have been thrashing you could not have been thrashing he could not have been thrashing we could not have been thrashing you could not have been thrashing they could not have been thrashing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
could I not thrash? could you not thrash? could he not thrash? could we not thrash? could you not thrash? could they not thrash?	could I not be thrashing? could you not be thrashing? could he not be thrashing? could we not be thrashing? could you not be thrashing? could they not be thrashing?
Perfect	V-ing perfect
could I not have thrashed? could you not have thrashed? could he not have thrashed? could we not have thrashed? could you not have thrashed? could they not have thrashed?	could I not have been thrashing? could you not have been thrashing? could he not have been thrashing? could we not have been thrashing? could you not have been thrashing? could they not have been thrashing?