English verb conjugation
COULD UNDERSTATE

Regular verb: understate - understated - understated

Affirmation

Simple form	V-ing form
I could understate you could understate he could understate we could understate you could understate they could understate	I could be understating you could be understating he could be understating we could be understating you could be understating they could be understating
Perfect	V-ing perfect
I could have understated you could have understated he could have understated we could have understated you could have understated they could have understated	I could have been understating you could have been understating he could have been understating we could have been understating you could have been understating they could have been understating

Negation

Simple form	V-ing form
I could not understate you could not understate he could not understate we could not understate you could not understate they could not understate	I could not be understating you could not be understating he could not be understating we could not be understating you could not be understating they could not be understating
Perfect	V-ing perfect
I could not have understated you could not have understated he could not have understated we could not have understated you could not have understated they could not have understated	I could not have been understating you could not have been understating he could not have been understating we could not have been understating you could not have been understating they could not have been understating

Interrogative form

Simple form	V-ing form
could I understate? could you understate? could he understate? could we understate? could you understate? could they understate?	could I be understating? could you be understating? could he be understating? could we be understating? could you be understating? could they be understating?
Perfect	V-ing perfect
could I have understated? could you have understated? could he have understated? could we have understated? could you have understated? could they have understated?	could I have been understating? could you have been understating? could he have been understating? could we have been understating? could you have been understating? could they have been understating?

Interro-negative form

Simple form	V-ing form
could I not understate? could you not understate? could he not understate? could we not understate? could you not understate? could they not understate?	could I not be understating? could you not be understating? could he not be understating? could we not be understating? could you not be understating? could they not be understating?
Perfect	V-ing perfect
could I not have understated? could you not have understated? could he not have understated? could we not have understated? could you not have understated? could they not have understated?	could I not have been understating? could you not have been understating? could he not have been understating? could we not have been understating? could you not have been understating? could they not have been understating?