English verb conjugation
COULD PREINVESTIGATE PREINVESTIGATE

Regular verb: preinvestigate preinvestigate - preinvestigate preinvestigated - preinvestigate preinvestigated

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could preinvestigate preinvestigate you could preinvestigate preinvestigate he could preinvestigate preinvestigate we could preinvestigate preinvestigate you could preinvestigate preinvestigate they could preinvestigate preinvestigate	I could be preinvestigate preinvestigating you could be preinvestigate preinvestigating he could be preinvestigate preinvestigating we could be preinvestigate preinvestigating you could be preinvestigate preinvestigating they could be preinvestigate preinvestigating
Perfect	V-ing perfect
I could have preinvestigate preinvestigated you could have preinvestigate preinvestigated he could have preinvestigate preinvestigated we could have preinvestigate preinvestigated you could have preinvestigate preinvestigated they could have preinvestigate preinvestigated	I could have been preinvestigate preinvestigating you could have been preinvestigate preinvestigating he could have been preinvestigate preinvestigating we could have been preinvestigate preinvestigating you could have been preinvestigate preinvestigating they could have been preinvestigate preinvestigating

Negation

Simple form	V-ing form
I couldn't preinvestigate preinvestigate you couldn't preinvestigate preinvestigate he couldn't preinvestigate preinvestigate we couldn't preinvestigate preinvestigate you couldn't preinvestigate preinvestigate they couldn't preinvestigate preinvestigate	I couldn't be preinvestigate preinvestigating you couldn't be preinvestigate preinvestigating he couldn't be preinvestigate preinvestigating we couldn't be preinvestigate preinvestigating you couldn't be preinvestigate preinvestigating they couldn't be preinvestigate preinvestigating
Perfect	V-ing perfect
I couldn't have preinvestigate preinvestigated you couldn't have preinvestigate preinvestigated he couldn't have preinvestigate preinvestigated we couldn't have preinvestigate preinvestigated you couldn't have preinvestigate preinvestigated they couldn't have preinvestigate preinvestigated	I couldn't have been preinvestigate preinvestigating you couldn't have been preinvestigate preinvestigating he couldn't have been preinvestigate preinvestigating we couldn't have been preinvestigate preinvestigating you couldn't have been preinvestigate preinvestigating they couldn't have been preinvestigate preinvestigating

Interrogative form

Simple form	V-ing form
could I preinvestigate preinvestigate? could you preinvestigate preinvestigate? could he preinvestigate preinvestigate? could we preinvestigate preinvestigate? could you preinvestigate preinvestigate? could they preinvestigate preinvestigate?	could I be preinvestigate preinvestigating? could you be preinvestigate preinvestigating? could he be preinvestigate preinvestigating? could we be preinvestigate preinvestigating? could you be preinvestigate preinvestigating? could they be preinvestigate preinvestigating?
Perfect	V-ing perfect
could I have preinvestigate preinvestigated? could you have preinvestigate preinvestigated? could he have preinvestigate preinvestigated? could we have preinvestigate preinvestigated? could you have preinvestigate preinvestigated? could they have preinvestigate preinvestigated?	could I have been preinvestigate preinvestigating? could you have been preinvestigate preinvestigating? could he have been preinvestigate preinvestigating? could we have been preinvestigate preinvestigating? could you have been preinvestigate preinvestigating? could they have been preinvestigate preinvestigating?

Interro-negative form

Simple form	V-ing form
couldn't I preinvestigate preinvestigate? couldn't you preinvestigate preinvestigate? couldn't he preinvestigate preinvestigate? couldn't we preinvestigate preinvestigate? couldn't you preinvestigate preinvestigate? couldn't they preinvestigate preinvestigate?	couldn't I be preinvestigate preinvestigating? couldn't you be preinvestigate preinvestigating? couldn't he be preinvestigate preinvestigating? couldn't we be preinvestigate preinvestigating? couldn't you be preinvestigate preinvestigating? couldn't they be preinvestigate preinvestigating?
Perfect	V-ing perfect
couldn't I have preinvestigate preinvestigated? couldn't you have preinvestigate preinvestigated? couldn't he have preinvestigate preinvestigated? couldn't we have preinvestigate preinvestigated? couldn't you have preinvestigate preinvestigated? couldn't they have preinvestigate preinvestigated?	couldn't I have been preinvestigate preinvestigating? couldn't you have been preinvestigate preinvestigating? couldn't he have been preinvestigate preinvestigating? couldn't we have been preinvestigate preinvestigating? couldn't you have been preinvestigate preinvestigating? couldn't they have been preinvestigate preinvestigating?