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Glossary of Grammatical Terms- By adding –s if there is a vowel before the -y
- By changing –y into –ies if a noun ends in a consonant before the -y.
| Singular | Plural |
| analysis | analyses |
| axis | axes |
| basis | bases |
| crisis | crises |
| diagnosis | diagnoses |
| ellipsis | ellipses |
| hypothesis | hypotheses |
| oasis | oases |
| parenthesis | parentheses |
| thesis | theses |
