Some English words whose plural forms you may not know

The overfamiliarity with the fact that most English nouns either take "s", "es", "ies" or "ves" as plural markers has posed a lot of problems among most second learners of English as they ignorantly apply this standard rule to nouns that do not belong to this school of thought. A typical example is the word, criteria. Criteria is the plural form of criterion, but in this part of the world where English is spoken and learnt as a second language, you often hear its users say "criterias". To this effect, this article provides the plural forms of some English words that do not form their plural forms with any of the aforementioned plural markers.

S/N	SINGULAR NOUNS	PLURAL FORMS
1	Appendix	Appendices
2	Apex	Apices
3	Thesis	Theses
4	Crisis	Crises
5	Curriculum	Curricula
6	Criterion	Criteria
7	Phenomenon	Phenomena
8	Corpus	Corpora
9	Index	Indices
10	Nucleus	Nuclei
11	Ox	Oxen
12	Agendum	Agenda
13	Alga	Algae
14	Alumnus/Alumna	Alumni
15	Syllabus	Syllabi
16	Datum	Data
17	Amoeba	Amoebae
18	Addendum	Addenda
19	Memorandum	Memoranda
20	Bacterium	Bacteria
21	Fungus	Fungi
22	Vertebra	Vertebrae
23	Larva	Larvae
24	Genus	Genera
25	Stimulus	Stimuli

READ ALSO: SOME ENGLISH WORDS THAT DO NOT ACCEPT PLURAL MARKERS

Do you have any other English nouns whose plural forms you don’t know? Kindly use the comment box to state them. We will provide you with the answers ASAP.