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 couldn't pretreat you couldn't pretreat he couldn't pretreat we couldn't pretreat you couldn't pretreat they couldn't pretreat	I couldn't be pretreating you couldn't be pretreating he couldn't be pretreating we couldn't be pretreating you couldn't be pretreating they couldn't be pretreating
Perfect	V-ing perfect
I couldn't have pretreated you couldn't have pretreated he couldn't have pretreated we couldn't have pretreated you couldn't have pretreated they couldn't have pretreated	I couldn't have been pretreating you couldn't have been pretreating he couldn't have been pretreating we couldn't have been pretreating you couldn't have been pretreating they couldn't 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
couldn't I pretreat? couldn't you pretreat? couldn't he pretreat? couldn't we pretreat? couldn't you pretreat? couldn't they pretreat?	couldn't I be pretreating? couldn't you be pretreating? couldn't he be pretreating? couldn't we be pretreating? couldn't you be pretreating? couldn't they be pretreating?
Perfect	V-ing perfect
couldn't I have pretreated? couldn't you have pretreated? couldn't he have pretreated? couldn't we have pretreated? couldn't you have pretreated? couldn't they have pretreated?	couldn't I have been pretreating? couldn't you have been pretreating? couldn't he have been pretreating? couldn't we have been pretreating? couldn't you have been pretreating? couldn't they have been pretreating?