I can fool you can fool she can fool we can fool you can fool they can fool
V-ing form
I can be fooling you can be fooling she can be fooling we can be fooling you can be fooling they can be fooling
Perfect
I can have fooled you can have fooled she can have fooled we can have fooled you can have fooled they can have fooled
V-ing perfect
I can have been fooling you can have been fooling she can have been fooling we can have been fooling you can have been fooling they can have been fooling
Negation
Simple form
I can't fool you can't fool she can't fool we can't fool you can't fool they can't fool
V-ing form
I can't be fooling you can't be fooling she can't be fooling we can't be fooling you can't be fooling they can't be fooling
Perfect
I can't have fooled you can't have fooled she can't have fooled we can't have fooled you can't have fooled they can't have fooled
V-ing perfect
I can't have been fooling you can't have been fooling she can't have been fooling we can't have been fooling you can't have been fooling they can't have been fooling
Interrogative form
Simple form
can I fool? can you fool? can she fool? can we fool? can you fool? can they fool?
V-ing form
can I be fooling? can you be fooling? can she be fooling? can we be fooling? can you be fooling? can they be fooling?
Perfect
can I have fooled? can you have fooled? can she have fooled? can we have fooled? can you have fooled? can they have fooled?
V-ing perfect
can I have been fooling? can you have been fooling? can she have been fooling? can we have been fooling? can you have been fooling? can they have been fooling?
Interro-negative form
Simple form
can't I fool? can't you fool? can't she fool? can't we fool? can't you fool? can't they fool?
V-ing form
can't I be fooling? can't you be fooling? can't she be fooling? can't we be fooling? can't you be fooling? can't they be fooling?
Perfect
can't I have fooled? can't you have fooled? can't she have fooled? can't we have fooled? can't you have fooled? can't they have fooled?
V-ing perfect
can't I have been fooling? can't you have been fooling? can't she have been fooling? can't we have been fooling? can't you have been fooling? can't they have been fooling?