I can infect you can infect he can infect we can infect you can infect they can infect
V-ing form
I can be infecting you can be infecting he can be infecting we can be infecting you can be infecting they can be infecting
Perfect
I can have infected you can have infected he can have infected we can have infected you can have infected they can have infected
V-ing perfect
I can have been infecting you can have been infecting he can have been infecting we can have been infecting you can have been infecting they can have been infecting
Negation
Simple form
I can't infect you can't infect he can't infect we can't infect you can't infect they can't infect
V-ing form
I can't be infecting you can't be infecting he can't be infecting we can't be infecting you can't be infecting they can't be infecting
Perfect
I can't have infected you can't have infected he can't have infected we can't have infected you can't have infected they can't have infected
V-ing perfect
I can't have been infecting you can't have been infecting he can't have been infecting we can't have been infecting you can't have been infecting they can't have been infecting
Interrogative form
Simple form
can I infect? can you infect? can he infect? can we infect? can you infect? can they infect?
V-ing form
can I be infecting? can you be infecting? can he be infecting? can we be infecting? can you be infecting? can they be infecting?
Perfect
can I have infected? can you have infected? can he have infected? can we have infected? can you have infected? can they have infected?
V-ing perfect
can I have been infecting? can you have been infecting? can he have been infecting? can we have been infecting? can you have been infecting? can they have been infecting?
Interro-negative form
Simple form
can't I infect? can't you infect? can't he infect? can't we infect? can't you infect? can't they infect?
V-ing form
can't I be infecting? can't you be infecting? can't he be infecting? can't we be infecting? can't you be infecting? can't they be infecting?
Perfect
can't I have infected? can't you have infected? can't he have infected? can't we have infected? can't you have infected? can't they have infected?
V-ing perfect
can't I have been infecting? can't you have been infecting? can't he have been infecting? can't we have been infecting? can't you have been infecting? can't they have been infecting?