I could anesthetize you could anesthetize he could anesthetize we could anesthetize you could anesthetize they could anesthetize
V-ing form
I could be anesthetizing you could be anesthetizing he could be anesthetizing we could be anesthetizing you could be anesthetizing they could be anesthetizing
Perfect
I could have anesthetized you could have anesthetized he could have anesthetized we could have anesthetized you could have anesthetized they could have anesthetized
V-ing perfect
I could have been anesthetizing you could have been anesthetizing he could have been anesthetizing we could have been anesthetizing you could have been anesthetizing they could have been anesthetizing
Negation
Simple form
I couldn't anesthetize you couldn't anesthetize he couldn't anesthetize we couldn't anesthetize you couldn't anesthetize they couldn't anesthetize
V-ing form
I couldn't be anesthetizing you couldn't be anesthetizing he couldn't be anesthetizing we couldn't be anesthetizing you couldn't be anesthetizing they couldn't be anesthetizing
Perfect
I couldn't have anesthetized you couldn't have anesthetized he couldn't have anesthetized we couldn't have anesthetized you couldn't have anesthetized they couldn't have anesthetized
V-ing perfect
I couldn't have been anesthetizing you couldn't have been anesthetizing he couldn't have been anesthetizing we couldn't have been anesthetizing you couldn't have been anesthetizing they couldn't have been anesthetizing
Interrogative form
Simple form
could I anesthetize? could you anesthetize? could he anesthetize? could we anesthetize? could you anesthetize? could they anesthetize?
V-ing form
could I be anesthetizing? could you be anesthetizing? could he be anesthetizing? could we be anesthetizing? could you be anesthetizing? could they be anesthetizing?
Perfect
could I have anesthetized? could you have anesthetized? could he have anesthetized? could we have anesthetized? could you have anesthetized? could they have anesthetized?
V-ing perfect
could I have been anesthetizing? could you have been anesthetizing? could he have been anesthetizing? could we have been anesthetizing? could you have been anesthetizing? could they have been anesthetizing?
Interro-negative form
Simple form
couldn't I anesthetize? couldn't you anesthetize? couldn't he anesthetize? couldn't we anesthetize? couldn't you anesthetize? couldn't they anesthetize?
V-ing form
couldn't I be anesthetizing? couldn't you be anesthetizing? couldn't he be anesthetizing? couldn't we be anesthetizing? couldn't you be anesthetizing? couldn't they be anesthetizing?
Perfect
couldn't I have anesthetized? couldn't you have anesthetized? couldn't he have anesthetized? couldn't we have anesthetized? couldn't you have anesthetized? couldn't they have anesthetized?
V-ing perfect
couldn't I have been anesthetizing? couldn't you have been anesthetizing? couldn't he have been anesthetizing? couldn't we have been anesthetizing? couldn't you have been anesthetizing? couldn't they have been anesthetizing?