English verb conjugation
COULD VIBRATE

Regular verb: vibrate - vibrated - vibrated

Affirmation

Simple form	V-ing form
I could vibrate you could vibrate he could vibrate we could vibrate you could vibrate they could vibrate	I could be vibrating you could be vibrating he could be vibrating we could be vibrating you could be vibrating they could be vibrating
Perfect	V-ing perfect
I could have vibrated you could have vibrated he could have vibrated we could have vibrated you could have vibrated they could have vibrated	I could have been vibrating you could have been vibrating he could have been vibrating we could have been vibrating you could have been vibrating they could have been vibrating

Negation

Simple form	V-ing form
I could not vibrate you could not vibrate he could not vibrate we could not vibrate you could not vibrate they could not vibrate	I could not be vibrating you could not be vibrating he could not be vibrating we could not be vibrating you could not be vibrating they could not be vibrating
Perfect	V-ing perfect
I could not have vibrated you could not have vibrated he could not have vibrated we could not have vibrated you could not have vibrated they could not have vibrated	I could not have been vibrating you could not have been vibrating he could not have been vibrating we could not have been vibrating you could not have been vibrating they could not have been vibrating

Interrogative form

Simple form	V-ing form
could I vibrate? could you vibrate? could he vibrate? could we vibrate? could you vibrate? could they vibrate?	could I be vibrating? could you be vibrating? could he be vibrating? could we be vibrating? could you be vibrating? could they be vibrating?
Perfect	V-ing perfect
could I have vibrated? could you have vibrated? could he have vibrated? could we have vibrated? could you have vibrated? could they have vibrated?	could I have been vibrating? could you have been vibrating? could he have been vibrating? could we have been vibrating? could you have been vibrating? could they have been vibrating?

Interro-negative form

Simple form	V-ing form
could I not vibrate? could you not vibrate? could he not vibrate? could we not vibrate? could you not vibrate? could they not vibrate?	could I not be vibrating? could you not be vibrating? could he not be vibrating? could we not be vibrating? could you not be vibrating? could they not be vibrating?
Perfect	V-ing perfect
could I not have vibrated? could you not have vibrated? could he not have vibrated? could we not have vibrated? could you not have vibrated? could they not have vibrated?	could I not have been vibrating? could you not have been vibrating? could he not have been vibrating? could we not have been vibrating? could you not have been vibrating? could they not have been vibrating?