English verb conjugation
COULD PRETREAT

Regular verb: pretreat - pretreated - pretreated

Affirmation

Simple form	V-ing form
I could pretreat you could pretreat he could pretreat we could pretreat you could pretreat they could pretreat	I could be pretreating you could be pretreating he could be pretreating we could be pretreating you could be pretreating they could be pretreating
Perfect	V-ing perfect
I could have pretreated you could have pretreated he could have pretreated we could have pretreated you could have pretreated they could have pretreated	I could have been pretreating you could have been pretreating he could have been pretreating we could have been pretreating you could have been pretreating they could have been pretreating

Negation

Simple form	V-ing form
I could not pretreat you could not pretreat he could not pretreat we could not pretreat you could not pretreat they could not pretreat	I could not be pretreating you could not be pretreating he could not be pretreating we could not be pretreating you could not be pretreating they could not be pretreating
Perfect	V-ing perfect
I could not have pretreated you could not have pretreated he could not have pretreated we could not have pretreated you could not have pretreated they could not have pretreated	I could not have been pretreating you could not have been pretreating he could not have been pretreating we could not have been pretreating you could not have been pretreating they could not have been pretreating

Interrogative form

Simple form	V-ing form
could I pretreat? could you pretreat? could he pretreat? could we pretreat? could you pretreat? could they pretreat?	could I be pretreating? could you be pretreating? could he be pretreating? could we be pretreating? could you be pretreating? could they be pretreating?
Perfect	V-ing perfect
could I have pretreated? could you have pretreated? could he have pretreated? could we have pretreated? could you have pretreated? could they have pretreated?	could I have been pretreating? could you have been pretreating? could he have been pretreating? could we have been pretreating? could you have been pretreating? could they have been pretreating?

Interro-negative form

Simple form	V-ing form
could I not pretreat? could you not pretreat? could he not pretreat? could we not pretreat? could you not pretreat? could they not pretreat?	could I not be pretreating? could you not be pretreating? could he not be pretreating? could we not be pretreating? could you not be pretreating? could they not be pretreating?
Perfect	V-ing perfect
could I not have pretreated? could you not have pretreated? could he not have pretreated? could we not have pretreated? could you not have pretreated? could they not have pretreated?	could I not have been pretreating? could you not have been pretreating? could he not have been pretreating? could we not have been pretreating? could you not have been pretreating? could they not have been pretreating?