English verb conjugation
CAN PREINVESTIGATE

Regular verb: preinvestigate - preinvestigated - preinvestigated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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