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