English verb conjugation
COULD THUMB-INDEX

Regular verb: thumb-index - thumb-indexed - thumb-indexed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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