English verb conjugation
COULD FLUCTUATE

Regular verb: fluctuate - fluctuated - fluctuated

Affirmation

Simple form	V-ing form
I could fluctuate you could fluctuate he could fluctuate we could fluctuate you could fluctuate they could fluctuate	I could be fluctuating you could be fluctuating he could be fluctuating we could be fluctuating you could be fluctuating they could be fluctuating
Perfect	V-ing perfect
I could have fluctuated you could have fluctuated he could have fluctuated we could have fluctuated you could have fluctuated they could have fluctuated	I could have been fluctuating you could have been fluctuating he could have been fluctuating we could have been fluctuating you could have been fluctuating they could have been fluctuating

Negation

Simple form	V-ing form
I could not fluctuate you could not fluctuate he could not fluctuate we could not fluctuate you could not fluctuate they could not fluctuate	I could not be fluctuating you could not be fluctuating he could not be fluctuating we could not be fluctuating you could not be fluctuating they could not be fluctuating
Perfect	V-ing perfect
I could not have fluctuated you could not have fluctuated he could not have fluctuated we could not have fluctuated you could not have fluctuated they could not have fluctuated	I could not have been fluctuating you could not have been fluctuating he could not have been fluctuating we could not have been fluctuating you could not have been fluctuating they could not have been fluctuating

Interrogative form

Simple form	V-ing form
could I fluctuate? could you fluctuate? could he fluctuate? could we fluctuate? could you fluctuate? could they fluctuate?	could I be fluctuating? could you be fluctuating? could he be fluctuating? could we be fluctuating? could you be fluctuating? could they be fluctuating?
Perfect	V-ing perfect
could I have fluctuated? could you have fluctuated? could he have fluctuated? could we have fluctuated? could you have fluctuated? could they have fluctuated?	could I have been fluctuating? could you have been fluctuating? could he have been fluctuating? could we have been fluctuating? could you have been fluctuating? could they have been fluctuating?

Interro-negative form

Simple form	V-ing form
could I not fluctuate? could you not fluctuate? could he not fluctuate? could we not fluctuate? could you not fluctuate? could they not fluctuate?	could I not be fluctuating? could you not be fluctuating? could he not be fluctuating? could we not be fluctuating? could you not be fluctuating? could they not be fluctuating?
Perfect	V-ing perfect
could I not have fluctuated? could you not have fluctuated? could he not have fluctuated? could we not have fluctuated? could you not have fluctuated? could they not have fluctuated?	could I not have been fluctuating? could you not have been fluctuating? could he not have been fluctuating? could we not have been fluctuating? could you not have been fluctuating? could they not have been fluctuating?