English verb conjugation
COULD INFECT

Regular verb: infect - infected - infected

Affirmation

Simple form	V-ing form
I could infect you could infect she could infect we could infect you could infect they could infect	I could be infecting you could be infecting she could be infecting we could be infecting you could be infecting they could be infecting
Perfect	V-ing perfect
I could have infected you could have infected she could have infected we could have infected you could have infected they could have infected	I could have been infecting you could have been infecting she could have been infecting we could have been infecting you could have been infecting they could have been infecting

Negation

Simple form	V-ing form
I couldn't infect you couldn't infect she couldn't infect we couldn't infect you couldn't infect they couldn't infect	I couldn't be infecting you couldn't be infecting she couldn't be infecting we couldn't be infecting you couldn't be infecting they couldn't be infecting
Perfect	V-ing perfect
I couldn't have infected you couldn't have infected she couldn't have infected we couldn't have infected you couldn't have infected they couldn't have infected	I couldn't have been infecting you couldn't have been infecting she couldn't have been infecting we couldn't have been infecting you couldn't have been infecting they couldn't have been infecting

Interrogative form

Simple form	V-ing form
could I infect? could you infect? could she infect? could we infect? could you infect? could they infect?	could I be infecting? could you be infecting? could she be infecting? could we be infecting? could you be infecting? could they be infecting?
Perfect	V-ing perfect
could I have infected? could you have infected? could she have infected? could we have infected? could you have infected? could they have infected?	could I have been infecting? could you have been infecting? could she have been infecting? could we have been infecting? could you have been infecting? could they have been infecting?

Interro-negative form

Simple form	V-ing form
couldn't I infect? couldn't you infect? couldn't she infect? couldn't we infect? couldn't you infect? couldn't they infect?	couldn't I be infecting? couldn't you be infecting? couldn't she be infecting? couldn't we be infecting? couldn't you be infecting? couldn't they be infecting?
Perfect	V-ing perfect
couldn't I have infected? couldn't you have infected? couldn't she have infected? couldn't we have infected? couldn't you have infected? couldn't they have infected?	couldn't I have been infecting? couldn't you have been infecting? couldn't she have been infecting? couldn't we have been infecting? couldn't you have been infecting? couldn't they have been infecting?