I can follow you can follow she can follow we can follow you can follow they can follow
V-ing form
I can be following you can be following she can be following we can be following you can be following they can be following
Perfect
I can have followed you can have followed she can have followed we can have followed you can have followed they can have followed
V-ing perfect
I can have been following you can have been following she can have been following we can have been following you can have been following they can have been following
Negation
Simple form
I can't follow you can't follow she can't follow we can't follow you can't follow they can't follow
V-ing form
I can't be following you can't be following she can't be following we can't be following you can't be following they can't be following
Perfect
I can't have followed you can't have followed she can't have followed we can't have followed you can't have followed they can't have followed
V-ing perfect
I can't have been following you can't have been following she can't have been following we can't have been following you can't have been following they can't have been following
Interrogative form
Simple form
can I follow? can you follow? can she follow? can we follow? can you follow? can they follow?
V-ing form
can I be following? can you be following? can she be following? can we be following? can you be following? can they be following?
Perfect
can I have followed? can you have followed? can she have followed? can we have followed? can you have followed? can they have followed?
V-ing perfect
can I have been following? can you have been following? can she have been following? can we have been following? can you have been following? can they have been following?
Interro-negative form
Simple form
can't I follow? can't you follow? can't she follow? can't we follow? can't you follow? can't they follow?
V-ing form
can't I be following? can't you be following? can't she be following? can't we be following? can't you be following? can't they be following?
Perfect
can't I have followed? can't you have followed? can't she have followed? can't we have followed? can't you have followed? can't they have followed?
V-ing perfect
can't I have been following? can't you have been following? can't she have been following? can't we have been following? can't you have been following? can't they have been following?