I packed three shirts and two pairs of shoes, but I completely forgot to bring a toothbrush!
Unlike Vietnamese, English requires an -s (or -es) at the end of countable nouns when there is more than one ("three shirts", "two shoes"). For a single item, always use the base singular form ("a toothbrush").
Grammatical number
Grammatical number is the singular vs plural distinction marked on nouns, pronouns, and verbs. Most English nouns add -s or -es to form plurals (book → books, box → boxes), but a handful keep older patterns: child → children, foot → feet, mouse → mice, sheep → sheep. Pronouns swap forms entirely (I → we, he → they).
Number governs subject-verb agreement: He goes but They go. Mismatching subject and verb (The team are/is winning) is one of the most common slips in writing — and one that catches the attention of any careful reader.
Noun
A noun is a word that names something — a person, place, thing, idea, action, or quality. Nouns are one of the open word classes in English, alongside verbs, adjectives, and adverbs. They typically appear as the subject or object of a clause, after articles or adjectives, and as the head of a noun phrase.
Recognising nouns reliably is the foundation for nearly every other grammar topic — agreement, articles, plurals, possessives, and prepositions all depend on it. Get this right and the rest of English grammar starts to fall into place.
A1 | Elementary | Beginners
A1 is the starting level of the CEFR framework — the entry point into English. At A1 you can introduce yourself, ask and answer simple personal questions, recognise common signs and instructions, and have short slow-paced conversations on very familiar topics.
Grammatically, A1 covers the building blocks: present-tense forms of be, have, and do; basic word order; simple questions; and the most common determiners, pronouns, and prepositions. Knowing your level matters — A1 material teaches the foundations every later level builds on, while a B1 textbook will overwhelm you. Start here and progress is fast.
Difficulty: Easy
The Easy difficulty tag marks questions and challenges aimed at beginners — typically A1 or early A2 level. Expect single-rule focus, short sentences, common everyday vocabulary, and one clear correct answer. Distractors usually rule themselves out quickly.
Filter by Easy when you're rebuilding fundamentals, warming up before harder material, or testing whether you've truly internalised a basic rule before moving on. Easy doesn't mean trivial — it means the rule itself is unambiguous and the context doesn't pile on extra complications.