English verb conjugation
COULD TRANQUILLIZE

Regular verb: tranquillize - tranquillized - tranquillized

Affirmation

Simple form	V-ing form
I could tranquillize you could tranquillize he could tranquillize we could tranquillize you could tranquillize they could tranquillize	I could be tranquillizing you could be tranquillizing he could be tranquillizing we could be tranquillizing you could be tranquillizing they could be tranquillizing
Perfect	V-ing perfect
I could have tranquillized you could have tranquillized he could have tranquillized we could have tranquillized you could have tranquillized they could have tranquillized	I could have been tranquillizing you could have been tranquillizing he could have been tranquillizing we could have been tranquillizing you could have been tranquillizing they could have been tranquillizing

Negation

Simple form	V-ing form
I couldn't tranquillize you couldn't tranquillize he couldn't tranquillize we couldn't tranquillize you couldn't tranquillize they couldn't tranquillize	I couldn't be tranquillizing you couldn't be tranquillizing he couldn't be tranquillizing we couldn't be tranquillizing you couldn't be tranquillizing they couldn't be tranquillizing
Perfect	V-ing perfect
I couldn't have tranquillized you couldn't have tranquillized he couldn't have tranquillized we couldn't have tranquillized you couldn't have tranquillized they couldn't have tranquillized	I couldn't have been tranquillizing you couldn't have been tranquillizing he couldn't have been tranquillizing we couldn't have been tranquillizing you couldn't have been tranquillizing they couldn't have been tranquillizing

Interrogative form

Simple form	V-ing form
could I tranquillize? could you tranquillize? could he tranquillize? could we tranquillize? could you tranquillize? could they tranquillize?	could I be tranquillizing? could you be tranquillizing? could he be tranquillizing? could we be tranquillizing? could you be tranquillizing? could they be tranquillizing?
Perfect	V-ing perfect
could I have tranquillized? could you have tranquillized? could he have tranquillized? could we have tranquillized? could you have tranquillized? could they have tranquillized?	could I have been tranquillizing? could you have been tranquillizing? could he have been tranquillizing? could we have been tranquillizing? could you have been tranquillizing? could they have been tranquillizing?

Interro-negative form

Simple form	V-ing form
couldn't I tranquillize? couldn't you tranquillize? couldn't he tranquillize? couldn't we tranquillize? couldn't you tranquillize? couldn't they tranquillize?	couldn't I be tranquillizing? couldn't you be tranquillizing? couldn't he be tranquillizing? couldn't we be tranquillizing? couldn't you be tranquillizing? couldn't they be tranquillizing?
Perfect	V-ing perfect
couldn't I have tranquillized? couldn't you have tranquillized? couldn't he have tranquillized? couldn't we have tranquillized? couldn't you have tranquillized? couldn't they have tranquillized?	couldn't I have been tranquillizing? couldn't you have been tranquillizing? couldn't he have been tranquillizing? couldn't we have been tranquillizing? couldn't you have been tranquillizing? couldn't they have been tranquillizing?