I can index you can index she can index we can index you can index they can index
V-ing form
I can be indexing you can be indexing she can be indexing we can be indexing you can be indexing they can be indexing
Perfect
I can have indexed you can have indexed she can have indexed we can have indexed you can have indexed they can have indexed
V-ing perfect
I can have been indexing you can have been indexing she can have been indexing we can have been indexing you can have been indexing they can have been indexing
Negation
Simple form
I can't index you can't index she can't index we can't index you can't index they can't index
V-ing form
I can't be indexing you can't be indexing she can't be indexing we can't be indexing you can't be indexing they can't be indexing
Perfect
I can't have indexed you can't have indexed she can't have indexed we can't have indexed you can't have indexed they can't have indexed
V-ing perfect
I can't have been indexing you can't have been indexing she can't have been indexing we can't have been indexing you can't have been indexing they can't have been indexing
Interrogative form
Simple form
can I index? can you index? can she index? can we index? can you index? can they index?
V-ing form
can I be indexing? can you be indexing? can she be indexing? can we be indexing? can you be indexing? can they be indexing?
Perfect
can I have indexed? can you have indexed? can she have indexed? can we have indexed? can you have indexed? can they have indexed?
V-ing perfect
can I have been indexing? can you have been indexing? can she have been indexing? can we have been indexing? can you have been indexing? can they have been indexing?
Interro-negative form
Simple form
can't I index? can't you index? can't she index? can't we index? can't you index? can't they index?
V-ing form
can't I be indexing? can't you be indexing? can't she be indexing? can't we be indexing? can't you be indexing? can't they be indexing?
Perfect
can't I have indexed? can't you have indexed? can't she have indexed? can't we have indexed? can't you have indexed? can't they have indexed?
V-ing perfect
can't I have been indexing? can't you have been indexing? can't she have been indexing? can't we have been indexing? can't you have been indexing? can't they have been indexing?