By changing –y into –ies if a noun ends in a consonant before the -y.
| Singular | Plural | Singular | Plural | |
|---|---|---|---|---|
| army | armies | enemy | enemies | |
| baby | babies | fairy | fairies | |
| beauty | beauties | family | families | |
| berry | berries | lady | ladies | |
| cherry | cherries | library | libraries | |
| city | cities | nappy | nappies | |
| country | countries | sky | skies | |
| cry | cries | spy | spies | |
| curry | curries | story | stories | |
| diary | diaries | strawberry | strawberries | |
| discovery | discoveries | territory | territories | |
| duty | duties | theory | theories |