English verb conjugation
COULD QUAKE

Regular verb: quake - quaked - quaked

Affirmation

Simple form	V-ing form
I could quake you could quake he could quake we could quake you could quake they could quake	I could be quaking you could be quaking he could be quaking we could be quaking you could be quaking they could be quaking
Perfect	V-ing perfect
I could have quaked you could have quaked he could have quaked we could have quaked you could have quaked they could have quaked	I could have been quaking you could have been quaking he could have been quaking we could have been quaking you could have been quaking they could have been quaking

Negation

Simple form	V-ing form
I could not quake you could not quake he could not quake we could not quake you could not quake they could not quake	I could not be quaking you could not be quaking he could not be quaking we could not be quaking you could not be quaking they could not be quaking
Perfect	V-ing perfect
I could not have quaked you could not have quaked he could not have quaked we could not have quaked you could not have quaked they could not have quaked	I could not have been quaking you could not have been quaking he could not have been quaking we could not have been quaking you could not have been quaking they could not have been quaking

Interrogative form

Simple form	V-ing form
could I quake? could you quake? could he quake? could we quake? could you quake? could they quake?	could I be quaking? could you be quaking? could he be quaking? could we be quaking? could you be quaking? could they be quaking?
Perfect	V-ing perfect
could I have quaked? could you have quaked? could he have quaked? could we have quaked? could you have quaked? could they have quaked?	could I have been quaking? could you have been quaking? could he have been quaking? could we have been quaking? could you have been quaking? could they have been quaking?

Interro-negative form

Simple form	V-ing form
could I not quake? could you not quake? could he not quake? could we not quake? could you not quake? could they not quake?	could I not be quaking? could you not be quaking? could he not be quaking? could we not be quaking? could you not be quaking? could they not be quaking?
Perfect	V-ing perfect
could I not have quaked? could you not have quaked? could he not have quaked? could we not have quaked? could you not have quaked? could they not have quaked?	could I not have been quaking? could you not have been quaking? could he not have been quaking? could we not have been quaking? could you not have been quaking? could they not have been quaking?