Nouns:
* Singular: bus, glass, kiss, box, fox
* Plural: cats, dogs, birds, trees, houses
* Proper Nouns: Jones, Davis, Williams, Paris, London
Verbs:
* Third Person Singular Present Tense: runs, walks, talks, sings, writes
* Present Participle (Gerund): reading, writing, running, swimming, dancing
Adjectives:
* Comparative: bigger, faster, stronger, colder, higher
* Superlative: biggest, fastest, strongest, coldest, highest
Other:
* Pronouns: its, hers, yours, theirs
* Prepositions: across, towards, besides
* Conjunctions: because, unless, whereas
* Interjections: oops, shh, phew
Words that are often confused:
* "s" vs. "es": The plural of words ending in "s", "x", "ch", "sh", and "z" is formed by adding "es". (e.g., buses, boxes, churches, wishes, buzzes).
* "s" vs. "ies": The plural of words ending in "y" preceded by a consonant is formed by changing "y" to "i" and adding "es". (e.g., baby - babies, lady - ladies).
This is just a small sample, and there are countless other words that end in "s".