English verb conjugation
SHOULD PREINVESTIGATE

Regular verb: preinvestigate - preinvestigated - preinvestigated

Affirmation

Simple form	V-ing form
I'd preinvestigate you'd preinvestigate she'd preinvestigate we'd preinvestigate you'd preinvestigate they'd preinvestigate	I'd be preinvestigating you'd be preinvestigating she'd be preinvestigating we'd be preinvestigating you'd be preinvestigating they'd be preinvestigating
Perfect	V-ing perfect
I should've preinvestigated you should've preinvestigated she should've preinvestigated we should've preinvestigated you should've preinvestigated they should've preinvestigated	I should've been preinvestigating you should've been preinvestigating she should've been preinvestigating we should've been preinvestigating you should've been preinvestigating they should've been preinvestigating

Negation

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

Interrogative form

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

Interro-negative form

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