could infect
Regular verb: infect - infected- infected

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