Choose the question that correctly asks who performed the action of inviting the strange guest.
A guy in a full dinosaur suit just walked into your living room. Since you definitely didn't invite him to the party, you turn to your roommate and ask: "___"
The correct answer is Who invited the dinosaur?.
You need a subject question because you want to know the identity of the person who performed the action (the subject). Therefore, you drop the auxiliary verb did and put the main verb in the past tense: "Who invited the dinosaur?"
"Who did the dinosaur invite?" is a perfectly formed object question, but it asks the wrong thing! It asks which lucky person received an invitation from the dinosaur.
Questions
Questions in English are typically formed by inverting the subject and an auxiliary verb: She can dance → Can she dance?. When there's no auxiliary present, English adds do-support: The milk goes in the fridge → Does the milk go in the fridge?. The same pattern handles wh-questions (Where do you live?) and negative questions (Doesn't he know?).
The trickiest variant is indirect questions — I wonder where he is, not where is he. The inversion drops because the question is embedded inside another clause. Getting this right is one of the bigger jumps from A2 to B1 fluency.
Interrogative sentence
An interrogative sentence asks a question. It ends with a question mark in writing and a rising intonation in speech: What do you want? / Are you feeling well? / Do you know who called? English forms questions by inverting the subject and an auxiliary verb (Are you ready?) or by adding do-support when no auxiliary is otherwise present (Do you know?).
Interrogatives split into yes/no questions (answerable with yes or no) and wh-questions (starting with what, where, when, who, why, how). It's one of the four sentence types alongside declaratives, imperatives, and exclamatives.
English Grammar Basics
The English Grammar Basics tag marks quizzes and explainers covering the foundations of English grammar — nouns, verbs, adjectives, adverbs, prepositions, conjunctions, tenses, voice, mood, and basic sentence structure.
If you're starting out or rebuilding from scratch, this is the tag to follow: every challenge under it is designed to land the core rules without burying you in exceptions. Get the basics solid here and the more advanced topics — conditionals, reported speech, inversion — stop looking like a wall of new rules and start looking like extensions of what you already know.
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.