Most nouns are made plural by adding s . Nouns ending in sh, ch, s , or x are made plural by adding es . Many nouns ending in f or fe are made plural by changing f or fe to ves .
Some nouns ending in o proceded by a consonant become plural by adding es .
Certain nouns change the vowel or add en . A few nouns are the same in both singular and plural. Some nouns have no singular form.