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 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
Perfect	V-ing perfect
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
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
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?
Perfect	V-ing perfect
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?