English verb conjugation
OUGHT TO PREINVESTIGATE

Regular verb: preinvestigate - preinvestigated - preinvestigated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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