The correct answers are lay, set, sit, and laid.
lay (first blank): This is the tricky past tense of the intransitive verb lie (to rest or recline). Because the actor rested on the floor without a direct object, we use lay. set vs sit: Set is transitive and requires an object (you set the poison vial). Sit is intransitive and takes no object (you just sit). laid: This is the past tense of the transitive verb lay. It requires a direct object (someone laid these heavy props).
Imperative mood
The imperative mood is the verb form English uses to give commands, instructions, requests, invitations, and warnings: Sit down, Pass the salt, Don't touch that, Have a great trip. It uses the bare verb form, omits the subject (an implied you), and is negated with don't.
Imperatives are everywhere — recipes, instructions, warning signs, road directions, casual requests. The challenge isn't forming them but choosing them: a bare imperative often sounds rude in English, so polite contexts swap them for question forms (Could you…?) or please.
Irregular verb
An irregular verb doesn't form its past tense and past participle by adding -ed — it changes shape in unpredictable ways: go → went → gone, eat → ate → eaten, put → put → put, take → took → taken. English has roughly 200 irregular verbs in common use, and many of them are the most frequently used verbs in the language (be, have, do, say, get, make, go, come).
Because the most-used verbs are irregular, you can't avoid them — they show up in every sentence. Memorising the three principal parts (base, past tense, past participle) of the top 100 is one of the highest-leverage moves at A2/B1.
Object
In grammar, an object is the entity a verb acts on. Tom studies grammar — grammar is the object. English distinguishes three types: a direct object (the thing acted on: Sam fed the dogs), an indirect object (the recipient: She sent him a present), and a prepositional object (introduced by a preposition: She is waiting for Lucy).
Knowing whether a verb takes an object — and which kind — is built into transitive and intransitive verb patterns. Pick the wrong pattern and the sentence either dangles or doubles up.
Past tense
The past tense is how English talks about events finished before now. It comes in four flavours: simple past (I walked) for completed events, past progressive (I was walking) for actions ongoing at a past time, past perfect (I had walked) for events before another past event, and past perfect progressive (I had been walking) for ongoing events leading up to a past point.
Choosing the right one is what makes past narratives clear instead of murky. When I arrived, she ate dinner is technically grammatical but means something different than had eaten (already done) or was eating (in progress when you arrived).
Transitive and intransitive verb
A transitive verb requires an object to complete its meaning (She broke the vase); an intransitive verb can't take a direct object (Rivers flow, Birds fly). Many verbs are ambitransitive — they work both ways with different meanings (She eats lunch / She eats slowly; The window broke / I broke the window).
This distinction matters because using a transitive verb without its object (She broke.) leaves the sentence dangling, and adding an object to an intransitive verb (She slept her bed) breaks it. Knowing each verb's pattern is essential for avoiding common A2/B1 mistakes.
Verb
A verb is a word that expresses an action, a state, or an occurrence — the engine of every English sentence. Most verbs have five forms: base (go), -s form (goes), past tense (went), past participle (gone), and -ing form (going). The verb be is the major exception with eight forms; modal verbs like can and must have fewer.
Verbs carry tense (when), aspect (how it unfolds), mood (the speaker's attitude), and voice (active vs passive). Mastering them is foundational — virtually every other grammar topic depends on getting verbs right.
Humor
The Humor tag marks questions and challenges where the author has tried — subjectively, deliberately — to make the practice itself entertaining. Expect characters, scenarios, and storylines that play with absurdity: zombies, alien tourists, a chef's disaster, a roommate's complaint. The grammar rule is real; the wrapping isn't.
Humor matters because grammar drills are forgettable. Tying a rule to a story your brain wants to keep makes it stick. Filter by Humor when motivation is what you're short on, not study time.
B2 | Upper Intermediate
B2 is the upper-intermediate level in the CEFR framework, sitting between B1 and C1. At B2 you can read editorials, follow most TED talks without subtitles, and hold extended conversations on abstract topics — including topics outside your everyday life.
Grammatically, B2 means flexible control of mixed conditionals, passive voice across tenses, reported speech with proper backshifting, and participle clauses. B2 is the standard target for university entrance exams (IELTS 5.5–6.5, TOEFL 87–109) and most skilled-migration thresholds — knowing whether you're there shapes your study plan.
Difficulty: Medium
The Medium difficulty tag marks questions and challenges in the middle of the difficulty range — typically suitable for A2 to B1 learners. Expect a single rule with realistic distractors, longer sentences, and contexts where you have to think before answering rather than reading off the obvious choice.
Filter by Medium when you're past the absolute basics and ready to consolidate. It's the level where most lasting progress happens — easy enough that you can finish without exhausting concentration, hard enough that getting it right means you've actually understood.