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