The correct answer is "is warm," which uses the verb "to be" and the adjective "warm" to describe the weather.
Adjective
- ✅ a tall building — ❌ a tally building
- ✅ The soup is hot — ❌ The soup is hotly
- ✅ a lovely small old table — ❌ a small lovely old table
- ✅ She seems tired — ❌ She seems tiredly
These bolded words are adjectives — words that describe nouns or pronouns. They sit before a noun (a tall building) or after a linking verb (The soup is hot).
Pattern: if a word can slot between a/the and a noun (a ___ thing) and can take -er/-est, it's almost certainly an adjective.
Verb
- walk → walk / walks / walked / walked / walking (5 forms, regular)
- go → go / goes / went / gone / going (5 forms, irregular)
- be → am/is/are/was/were/be/being/been (8 forms)
- can → can / could (modal: only 2 forms, no -s, no -ing)
A verb is the one word class every English sentence requires. Carries tense (when), aspect (duration), mood (attitude), and voice (active/passive). Regular verbs add -ed; ~200 irregular verbs have unpredictable past forms.
Key insight: fix your verbs and most grammar problems disappear. Wrong tense, wrong agreement, wrong form — verb errors account for the majority of grammatical mistakes.
Be
- ✅ I am tired. / She is tired. / They are tired. — present
- ✅ I was tired. / They were tired. — past
- ✅ She is running. — auxiliary for progressive
- ✅ It was broken. — auxiliary for passive
Be has 8 forms (am/is/are/was/were/be/being/been) — the most irregular verb in English. Two jobs: copula linking subject to complement (She is a doctor) and auxiliary for progressive and passive.
Trap: be changes for person AND number in both present and past. No other English verb does this. Learn the grid: I am / you are / he is / we are + I was / you were / he was / we were.
Adjective and adverb
- ✅ a quick response — ❌ a quickly response
- ✅ she spoke quietly — ❌ she spoke quiet
- ✅ the food tastes good — ❌ the food tastes well
- ✅ he runs fast — ✅ a fast car (same word, both roles)
Adjectives modify nouns; adverbs modify verbs, adjectives, or other adverbs. Most adverbs add -ly to the adjective (slow → slowly), but some words — fast, hard, late — serve as both without changing form.
Rule: if the word describes a noun → adjective. If it describes an action or degree → adverb.
A1 | Elementary | Beginners
- ✅ My name is Anna. — present simple of be
- ✅ Where is the station? — basic *wh-*question
- ✅ I have two brothers. — possession with have
- ✅ She likes coffee. — third-person -s
These are A1 sentences — the starting level of the CEFR framework. At A1 you can introduce yourself, ask and answer simple personal questions, and handle basic everyday transactions using present tense, be/have/do, and core vocabulary.
If you can say these but freeze at normal speaking speed, you're solidly A1 — and that's exactly where to start.
Easy
- She is a teacher. — one verb form, one rule
- I have two cats. — basic possession, short sentence
- He doesn't like coffee. — simple negation with do-support
- Only one answer is clearly correct; distractors are obviously wrong.
Easy marks beginner-level challenges: A1–early A2, one rule at a time, everyday vocabulary, no trick questions.
Use "Easy" when you want to build confidence on a specific rule without interference from other grammar or tricky contexts.