I can visit you can visit she can visit we can visit you can visit they can visit
V-ing form
I can be visiting you can be visiting she can be visiting we can be visiting you can be visiting they can be visiting
Perfect
I can have visited you can have visited she can have visited we can have visited you can have visited they can have visited
V-ing perfect
I can have been visiting you can have been visiting she can have been visiting we can have been visiting you can have been visiting they can have been visiting
Negation
Simple form
I can't visit you can't visit she can't visit we can't visit you can't visit they can't visit
V-ing form
I can't be visiting you can't be visiting she can't be visiting we can't be visiting you can't be visiting they can't be visiting
Perfect
I can't have visited you can't have visited she can't have visited we can't have visited you can't have visited they can't have visited
V-ing perfect
I can't have been visiting you can't have been visiting she can't have been visiting we can't have been visiting you can't have been visiting they can't have been visiting
Interrogative form
Simple form
can I visit? can you visit? can she visit? can we visit? can you visit? can they visit?
V-ing form
can I be visiting? can you be visiting? can she be visiting? can we be visiting? can you be visiting? can they be visiting?
Perfect
can I have visited? can you have visited? can she have visited? can we have visited? can you have visited? can they have visited?
V-ing perfect
can I have been visiting? can you have been visiting? can she have been visiting? can we have been visiting? can you have been visiting? can they have been visiting?
Interro-negative form
Simple form
can't I visit? can't you visit? can't she visit? can't we visit? can't you visit? can't they visit?
V-ing form
can't I be visiting? can't you be visiting? can't she be visiting? can't we be visiting? can't you be visiting? can't they be visiting?
Perfect
can't I have visited? can't you have visited? can't she have visited? can't we have visited? can't you have visited? can't they have visited?
V-ing perfect
can't I have been visiting? can't you have been visiting? can't she have been visiting? can't we have been visiting? can't you have been visiting? can't they have been visiting?