English verb conjugation
COULD TRANQUILIZE

Regular verb: tranquilize - tranquilized - tranquilized

Affirmation

Simple form	V-ing form
I could tranquilize you could tranquilize she could tranquilize we could tranquilize you could tranquilize they could tranquilize	I could be tranquilizing you could be tranquilizing she could be tranquilizing we could be tranquilizing you could be tranquilizing they could be tranquilizing
Perfect	V-ing perfect
I could have tranquilized you could have tranquilized she could have tranquilized we could have tranquilized you could have tranquilized they could have tranquilized	I could have been tranquilizing you could have been tranquilizing she could have been tranquilizing we could have been tranquilizing you could have been tranquilizing they could have been tranquilizing

Negation

Simple form	V-ing form
I couldn't tranquilize you couldn't tranquilize she couldn't tranquilize we couldn't tranquilize you couldn't tranquilize they couldn't tranquilize	I couldn't be tranquilizing you couldn't be tranquilizing she couldn't be tranquilizing we couldn't be tranquilizing you couldn't be tranquilizing they couldn't be tranquilizing
Perfect	V-ing perfect
I couldn't have tranquilized you couldn't have tranquilized she couldn't have tranquilized we couldn't have tranquilized you couldn't have tranquilized they couldn't have tranquilized	I couldn't have been tranquilizing you couldn't have been tranquilizing she couldn't have been tranquilizing we couldn't have been tranquilizing you couldn't have been tranquilizing they couldn't have been tranquilizing

Interrogative form

Simple form	V-ing form
could I tranquilize? could you tranquilize? could she tranquilize? could we tranquilize? could you tranquilize? could they tranquilize?	could I be tranquilizing? could you be tranquilizing? could she be tranquilizing? could we be tranquilizing? could you be tranquilizing? could they be tranquilizing?
Perfect	V-ing perfect
could I have tranquilized? could you have tranquilized? could she have tranquilized? could we have tranquilized? could you have tranquilized? could they have tranquilized?	could I have been tranquilizing? could you have been tranquilizing? could she have been tranquilizing? could we have been tranquilizing? could you have been tranquilizing? could they have been tranquilizing?

Interro-negative form

Simple form	V-ing form
couldn't I tranquilize? couldn't you tranquilize? couldn't she tranquilize? couldn't we tranquilize? couldn't you tranquilize? couldn't they tranquilize?	couldn't I be tranquilizing? couldn't you be tranquilizing? couldn't she be tranquilizing? couldn't we be tranquilizing? couldn't you be tranquilizing? couldn't they be tranquilizing?
Perfect	V-ing perfect
couldn't I have tranquilized? couldn't you have tranquilized? couldn't she have tranquilized? couldn't we have tranquilized? couldn't you have tranquilized? couldn't they have tranquilized?	couldn't I have been tranquilizing? couldn't you have been tranquilizing? couldn't she have been tranquilizing? couldn't we have been tranquilizing? couldn't you have been tranquilizing? couldn't they have been tranquilizing?