rēxera-m, rēxerā-s, rēxera-t, rēxerā-mus, rēxerā-tis, rēxera-nt.
[881.] The pluperfect subjunctive stem ends in -issē-, which becomes -isse- in some of the persons: as,
rēxisse-m, rēxissē-s, rēxisse-t, rēxissē-mus, rēxissē-tis, rēxisse-nt.
[882.] The future perfect stem ends in -erō- and -eri-: as,
rēxerō, rēxeri-s, rēxeri-t, rēxeri-mus, rēxeri-tis, rēxeri-nt.
[883.] In the future perfect, short i is found before the person endings -s, -mus, and -tis, some 40 times, as follows: -is, 29 times (Plaut. 2, Cic. 1, Catull. 1, Verg. 7, Hor. 12, Ov. 4, Germ. 1, Juv. 1); -imus, 3 times (Plaut., Ter., Lucr.); -itis, 8 times (Enn. 1, Plaut. 5, Ov. 2).
[884.] In the future perfect, long ī is found, as in the perfect subjunctive, some 33 times, thus: -īs, 28 times (Plaut. 3, Hor. 5, Ov. 15, Prop., Stat., Mart., Priap., inscr., once each), -īmus, once (Catull.), -ītis, 4 times (Ov. 3, Priap. 1).