"Let's" is a contraction of "let us" and is used to make suggestions. The correct sentence is "Let's go to the park!" because it correctly uses "Let's" and has the appropriate preposition "to" before "the park."
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.
Imperative mood
- ✅ Sit down. — command (bare verb, no subject)
- ✅ Don't touch that. — negative imperative
- ✅ Let's go. — first-person inclusive imperative
- ❌ You sit down. — adding you sounds aggressive (only for emphasis/anger)
The imperative mood uses the bare verb form with no stated subject for commands, instructions, requests, and invitations. Negated with don't. Softened with please or replaced by questions (Could you…?) for politeness.
Rule: imperative = base form of verb, no subject, no tense marking. If there's a subject or tense → it's not imperative.
A2 | Elementary | Pre-intermediate
- ✅ I went to the cinema yesterday. — past simple
- ✅ I have visited Paris twice. — present perfect (life experience)
- ✅ If it rains, I'll take an umbrella. — first conditional
- ✅ You should see a doctor. — modal for advice
These patterns are A2 — the second CEFR level. At A2 you move past survival phrases into real grammar: past tenses, the present perfect, basic conditionals, and modals for advice/obligation.
Marker: if you can describe yesterday and give simple advice, but struggle with abstractions or nuance, you're at A2.
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.