English verb conjugation
COULD CLASH

Regular verb: clash - clashed - clashed

Affirmation

Simple form	V-ing form
I could clash you could clash he could clash we could clash you could clash they could clash	I could be clashing you could be clashing he could be clashing we could be clashing you could be clashing they could be clashing
Perfect	V-ing perfect
I could have clashed you could have clashed he could have clashed we could have clashed you could have clashed they could have clashed	I could have been clashing you could have been clashing he could have been clashing we could have been clashing you could have been clashing they could have been clashing

Negation

Simple form	V-ing form
I could not clash you could not clash he could not clash we could not clash you could not clash they could not clash	I could not be clashing you could not be clashing he could not be clashing we could not be clashing you could not be clashing they could not be clashing
Perfect	V-ing perfect
I could not have clashed you could not have clashed he could not have clashed we could not have clashed you could not have clashed they could not have clashed	I could not have been clashing you could not have been clashing he could not have been clashing we could not have been clashing you could not have been clashing they could not have been clashing

Interrogative form

Simple form	V-ing form
could I clash? could you clash? could he clash? could we clash? could you clash? could they clash?	could I be clashing? could you be clashing? could he be clashing? could we be clashing? could you be clashing? could they be clashing?
Perfect	V-ing perfect
could I have clashed? could you have clashed? could he have clashed? could we have clashed? could you have clashed? could they have clashed?	could I have been clashing? could you have been clashing? could he have been clashing? could we have been clashing? could you have been clashing? could they have been clashing?

Interro-negative form

Simple form	V-ing form
could I not clash? could you not clash? could he not clash? could we not clash? could you not clash? could they not clash?	could I not be clashing? could you not be clashing? could he not be clashing? could we not be clashing? could you not be clashing? could they not be clashing?
Perfect	V-ing perfect
could I not have clashed? could you not have clashed? could he not have clashed? could we not have clashed? could you not have clashed? could they not have clashed?	could I not have been clashing? could you not have been clashing? could he not have been clashing? could we not have been clashing? could you not have been clashing? could they not have been clashing?