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Learn English > English lessons and exercises > English test #111421: Irregular plurals
Generally speaking, going from the singular form to the plural one is quite simple: simply add an -s to the singular.
Some other words ending with -f have a regular plural:
Some of these words have Greek or Latin origin:
- the endings in - on have their plurals in - a: criterion, phenomenon => criteria, phenomena.
- the endings in - is have their plurals in - es: a basis, thesis, hypothesis, analysis => bases, theses, hypotheses, analyses.
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