English verb conjugation
COULD QUASH

Regular verb: quash - quashed - quashed

Affirmation

Simple form	V-ing form
I could quash you could quash he could quash we could quash you could quash they could quash	I could be quashing you could be quashing he could be quashing we could be quashing you could be quashing they could be quashing
Perfect	V-ing perfect
I could have quashed you could have quashed he could have quashed we could have quashed you could have quashed they could have quashed	I could have been quashing you could have been quashing he could have been quashing we could have been quashing you could have been quashing they could have been quashing

Negation

Simple form	V-ing form
I could not quash you could not quash he could not quash we could not quash you could not quash they could not quash	I could not be quashing you could not be quashing he could not be quashing we could not be quashing you could not be quashing they could not be quashing
Perfect	V-ing perfect
I could not have quashed you could not have quashed he could not have quashed we could not have quashed you could not have quashed they could not have quashed	I could not have been quashing you could not have been quashing he could not have been quashing we could not have been quashing you could not have been quashing they could not have been quashing

Interrogative form

Simple form	V-ing form
could I quash? could you quash? could he quash? could we quash? could you quash? could they quash?	could I be quashing? could you be quashing? could he be quashing? could we be quashing? could you be quashing? could they be quashing?
Perfect	V-ing perfect
could I have quashed? could you have quashed? could he have quashed? could we have quashed? could you have quashed? could they have quashed?	could I have been quashing? could you have been quashing? could he have been quashing? could we have been quashing? could you have been quashing? could they have been quashing?

Interro-negative form

Simple form	V-ing form
could I not quash? could you not quash? could he not quash? could we not quash? could you not quash? could they not quash?	could I not be quashing? could you not be quashing? could he not be quashing? could we not be quashing? could you not be quashing? could they not be quashing?
Perfect	V-ing perfect
could I not have quashed? could you not have quashed? could he not have quashed? could we not have quashed? could you not have quashed? could they not have quashed?	could I not have been quashing? could you not have been quashing? could he not have been quashing? could we not have been quashing? could you not have been quashing? could they not have been quashing?