English verb conjugation
COULD PRETEST

Regular verb: pretest - pretested - pretested

Affirmation

Simple form	V-ing form
I could pretest you could pretest he could pretest we could pretest you could pretest they could pretest	I could be pretesting you could be pretesting he could be pretesting we could be pretesting you could be pretesting they could be pretesting
Perfect	V-ing perfect
I could have pretested you could have pretested he could have pretested we could have pretested you could have pretested they could have pretested	I could have been pretesting you could have been pretesting he could have been pretesting we could have been pretesting you could have been pretesting they could have been pretesting

Negation

Simple form	V-ing form
I couldn't pretest you couldn't pretest he couldn't pretest we couldn't pretest you couldn't pretest they couldn't pretest	I couldn't be pretesting you couldn't be pretesting he couldn't be pretesting we couldn't be pretesting you couldn't be pretesting they couldn't be pretesting
Perfect	V-ing perfect
I couldn't have pretested you couldn't have pretested he couldn't have pretested we couldn't have pretested you couldn't have pretested they couldn't have pretested	I couldn't have been pretesting you couldn't have been pretesting he couldn't have been pretesting we couldn't have been pretesting you couldn't have been pretesting they couldn't have been pretesting

Interrogative form

Simple form	V-ing form
could I pretest? could you pretest? could he pretest? could we pretest? could you pretest? could they pretest?	could I be pretesting? could you be pretesting? could he be pretesting? could we be pretesting? could you be pretesting? could they be pretesting?
Perfect	V-ing perfect
could I have pretested? could you have pretested? could he have pretested? could we have pretested? could you have pretested? could they have pretested?	could I have been pretesting? could you have been pretesting? could he have been pretesting? could we have been pretesting? could you have been pretesting? could they have been pretesting?

Interro-negative form

Simple form	V-ing form
couldn't I pretest? couldn't you pretest? couldn't he pretest? couldn't we pretest? couldn't you pretest? couldn't they pretest?	couldn't I be pretesting? couldn't you be pretesting? couldn't he be pretesting? couldn't we be pretesting? couldn't you be pretesting? couldn't they be pretesting?
Perfect	V-ing perfect
couldn't I have pretested? couldn't you have pretested? couldn't he have pretested? couldn't we have pretested? couldn't you have pretested? couldn't they have pretested?	couldn't I have been pretesting? couldn't you have been pretesting? couldn't he have been pretesting? couldn't we have been pretesting? couldn't you have been pretesting? couldn't they have been pretesting?