Namo Buddhassa
2 type of plurals-- noun, and verb. Noun plural type relate to your question.
1, ālapana(callig word), and 2 vidhatti same "citta" word. 3-7 vibhatti same "purisa" word.
Blod words are plural. Sorted by vibhatti.
1. Cittaṃ,
Cittāni.
ā. Cittā, he citta, he cittā, he
cittāni, he
cittā.
2. cittaṃ,
cittāni,
citte.
Theory from Niruttidīpanī 107 :
http://www.tipitaka.org/romn/cscd/e0201 ... ml#para1073. Purisena,
Purisehi,
purisebhi.
4. Purisassa,
Purisānaṃ.
5. purisasmā, purisamhā, Purisā,
purisehi,
purisebhi.
6. purisassa,
purisānaṃ.
7. purisasmiṃ, purisamhi, purise,
purisesu.
Theory from Niruttidīpanī 195 :
http://www.tipitaka.org/romn/cscd/e0201 ... ml#para195Example :
(Bold lines are pural.)
Dutiyo paricchedo.
Atha akārantapuṃsakaliṅgo cittasaddo vuccate.1.
Cittaṃ attano santānaṃ vijānāti
Cittāni attano sattānaṃ vijānanti
Calling.
Bho citta attano santānaṃ vijānāhi
Bho cittāni attano santānaṃ vijānātha
2.
Cittaṃ saññamessanti ye keci janā
Cittāni saññamessanti ye keci
3. Subject of sentence type.
Cittena sabbopi jano nīyyate
Cittehi sabbopi jano nīyyate
3. itself type.
Cittena saṃkilissati mānavo
Cittehi visujjhati kocimānavo
4.
Cittassa ovādaṃ deti koci jano
Cittānaṃ ovādaṃ denti keci janā
5.
Cittasmā ārammaṇaṃ uppajjati
Cittehi ārammaṇāni uppajjanti
6.
Cittassa aniccadhammassa vasamanvagū
Cittānaṃ parivitakko udapādi
7.
Citte arakkhite kāyakammaṃ arakkhitaṃ
Cittesu guttesu kāyakammaṃ rakkhitaṃ.
Iti paṭhamo pāṭho.
http://www.tipitaka.org/romn/cscd/e1211 ... ml#V0.0014PS. If your question refer to verb type, it should be like "jhā", "jhāyati", "jhāyanti", etc.