don't I preinvestigate? don't you preinvestigate? doesn't he preinvestigate? don't we preinvestigate? don't you preinvestigate? don't they preinvestigate?
Present continuous
am I not preinvestigating? aren't you preinvestigating? isn't he preinvestigating? aren't we preinvestigating? aren't you preinvestigating? aren't they preinvestigating?
Preterite
didn't I preinvestigate? didn't you preinvestigate? didn't he preinvestigate? didn't we preinvestigate? didn't you preinvestigate? didn't they preinvestigate?
Preterite continuous
wasn't I preinvestigating? weren't you preinvestigating? wasn't he preinvestigating? weren't we preinvestigating? weren't you preinvestigating? weren't they preinvestigating?
Present perfect
haven't I preinvestigated? haven't you preinvestigated? hasn't he preinvestigated? haven't we preinvestigated? haven't you preinvestigated? haven't they preinvestigated?
Present perfect continuous
haven't I been preinvestigating? haven't you been preinvestigating? hasn't he been preinvestigating? haven't we been preinvestigating? haven't you been preinvestigating? haven't they been preinvestigating?
Pluperfect
hadn't I preinvestigated? hadn't you preinvestigated? hadn't he preinvestigated? hadn't we preinvestigated? hadn't you preinvestigated? hadn't they preinvestigated?
Pluperfect continuous
hadn't I been preinvestigating? hadn't you been preinvestigating? hadn't he been preinvestigating? hadn't we been preinvestigating? hadn't you been preinvestigating? hadn't they been preinvestigating?
Future
won't I preinvestigate? won't you preinvestigate? won't he preinvestigate? won't we preinvestigate? won't you preinvestigate? won't they preinvestigate?
Future continuous
won't I be preinvestigating? won't you be preinvestigating? won't he be preinvestigating? won't we be preinvestigating? won't you be preinvestigating? won't they be preinvestigating?
Future perfect
won't I have preinvestigated? won't you have preinvestigated? won't he have preinvestigated? won't we have preinvestigated? won't you have preinvestigated? won't they have preinvestigated?
Future perfect continuous
won't I have been preinvestigating? won't you have been preinvestigating? won't he have been preinvestigating? won't we have been preinvestigating? won't you have been preinvestigating? won't they have been preinvestigating?
Conditional
Present
wouldn't I preinvestigate? wouldn't you preinvestigate? wouldn't he preinvestigate? wouldn't we preinvestigate? wouldn't you preinvestigate? wouldn't they preinvestigate?
Present continuous
wouldn't I be preinvestigating? wouldn't you be preinvestigating? wouldn't he be preinvestigating? wouldn't we be preinvestigating? wouldn't you be preinvestigating? wouldn't they be preinvestigating?
Past
wouldn't I have preinvestigated? wouldn't you have preinvestigated? wouldn't he have preinvestigated? wouldn't we have preinvestigated? wouldn't you have preinvestigated? wouldn't they have preinvestigated?
Past continuous
wouldn't I have been preinvestigating? wouldn't you have been preinvestigating? wouldn't he have been preinvestigating? wouldn't we have been preinvestigating? wouldn't you have been preinvestigating? wouldn't they have been preinvestigating?