can index
Regular verb: index - indexed- indexed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can index
you can index
he can index
we can index
you can index
they can index 	I can be indexing
you can be indexing
he can be indexing
we can be indexing
you can be indexing
they can be indexing	I can have indexed
you can have indexed
he can have indexed
we can have indexed
you can have indexed
they can have indexed	I can have been indexing
you can have been indexing
he can have been indexing
we can have been indexing
you can have been indexing
they can have been indexing	

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

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