It's Alex's first time at the airport, and he's a little nervous. Choose the correct phrase to complete the sentence.
After dropping off your luggage, you have to go ___ security before reaching the departure gate.
The correct answer is through.
At the airport, the fixed collocation is go through security (= pass the security checkpoint). We also say go through customs and go through passport control.
Preposition
A preposition is a small word that links a noun or noun phrase to other parts of the sentence — usually marking time, place, or relationship: in, on, at, to, from, with, over, under, between, during. The book on the table, We met at noon, She lives in Berlin.
Prepositions are deceptively small. Their meaning shifts dramatically by collocation (depend on, good at, afraid of), and their choice rarely translates directly between languages. Picking the right preposition is one of the trickiest, most idiomatic-sounding parts of English.
Phrasal verb
A phrasal verb is a verb combined with one or two short words — a particle, a preposition, or both — that together carry a meaning you can't predict from the parts: give up (quit), run into (meet by chance), put up with (tolerate). The combination behaves as a single unit even though it looks like several words.
English has thousands of these, and they're everywhere in everyday speech. Learning them as whole units — take off, look after, come across — beats trying to decode them word-by-word, and it's the fastest way to make your English sound less stiff and more natural.
Collocations
Collocations are combinations of words that habitually occur together in a fixed order — make a decision (not do a decision), strong coffee (not powerful coffee), heavy rain (not thick rain). The grammar would allow either pairing, but native speakers consistently pick one and reject the other. Common patterns include verb + noun, adjective + noun, adverb + adjective, and adverb + verb.
Learning vocabulary as collocations rather than isolated words is the single fastest way to sound natural in English. It's the difference between I made a big mistake and I did a big mistake — small, but immediately noticeable.
Vocabulary
The Vocabulary tag groups practice that focuses on words rather than grammar rules — common words, collocations, phrasal verbs, idioms, and the lexical patterns native speakers reach for instinctively. It cuts across grammar topics, offering targeted vocabulary work at every CEFR level from A1 to C2.
Grammar gets you the structure of English; vocabulary gets you the colour. Plenty of B1 grammar with A2 vocabulary still sounds simple; the right word at the right register is what shifts your English from "correct" to "natural".
A2 | Elementary | Pre-intermediate
A2 is the elementary level in the CEFR framework, sitting between A1 and B1. At A2 you can handle routine exchanges — ordering food, asking directions, making small talk — and describe your immediate environment in simple sentences.
Grammatically, A2 introduces past simple and past continuous, present perfect for experiences, basic modal verbs, and the first conditional. You're also picking up collocations and learning which verbs take gerunds vs. infinitives. Knowing your level here is the difference between confident progress and frustration: A2 material consolidates the basics; B1 will overwhelm you.
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.