English verb conjugation
COULD INDEX

Regular verb: index - indexed - indexed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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