Help Agent 007 complete his top-secret mission report by dragging the right words into the blanks.
I was waiting at the bus stop when a mysterious man approached. He placed an unmarked envelope on the bench and vanished into the night.
I was waiting at the bus stop when a mysterious man approached. He placed an unmarked envelope on the bench and vanished into the night.
at: We use "at" for specific point locations like a bus stop or a station.
an: Use "an" before singular, countable nouns that begin with a vowel sound (unmarked).
on: We use "on" for flat surfaces, like a bench, table, or wall.
the: "Into the night" is a specific idiomatic phrase requiring the definite article.
Preposition
Prepositions form a closed word class, although there are also certain phrases that serve as prepositions, such as in front of.
A single preposition may have a variety of meanings, often including temporal, spatial and abstract. Many words that are prepositions can also serve as adverbs. Examples of common English prepositions (including phrasal instances) are of, in, on, over, under, to, from, with, in front of, behind, opposite, by, before, after, during, through, in spite of or despite, between, among, etc.
A preposition is usually used with a noun phrase as its complement.
A preposition together with its complement is called a prepositional phrase.
Examples are in England, under the table, after six pleasant weeks, between the land and the sea.
A prepositional phrase can be used as a complement or post-modifier of a noun in a noun phrase, as in the man in the car, the start of the fight; as a complement of a verb or adjective, as in deal with the problem, proud of oneself; or generally as an adverb phrase.
English allows the use of "stranded" prepositions. This can occur in interrogative and relative clauses, where the interrogative or relative pronoun that is the preposition's complement is moved to the start (fronted), leaving the preposition in place. This kind of structure is avoided in some kinds of formal English.
For example:
- What are you talking about? (Possible alternative version: About what are you talking?)
- The song that you were listening to ... (more formal: The song to which you were listening ...)
Notice that in the second example the relative pronoun that could be omitted.
Stranded prepositions can also arise in passive voice constructions and other uses of passive past participial phrases, where the complement in a prepositional phrase can become zero in the same way that a verb's direct object would: it was looked at; I will be operated on; get your teeth seen to.
The same can happen in certain uses of infinitive phrases: he is nice to talk to; this is the page to make copies of.
Article
Articles are a small group of determinatives that signal whether a noun refers to something specific or something general. English has just three: the definite article the and the indefinite articles a and an. There's also a meaningful absence — the zero article — where no article appears at all. Mastering articles is one of the trickiest parts of English, because the rules involve both grammar and context.
The Definite Article: the
Use the when you expect the listener or reader already knows which thing you mean. This could be because it was mentioned before, because the situation makes it obvious, or because there's only one.
- I bought a jacket. The jacket was on sale.
- Can you close the door?
- The sun was setting behind the mountains.
The Indefinite Articles: a and an
Use a or an when introducing something for the first time or referring to any one member of a group. These only work with singular, countable nouns. Use a before consonant sounds and an before vowel sounds.
- She adopted a dog.
- He ate an apple.
The choice between a and an depends on the sound the next word starts with, not its spelling:
- ✅ an honest mistake (silent h → vowel sound)
- ❌ a honest mistake
- ✅ a university (starts with a /j/ consonant sound)
- ❌ an university
Self-check: Say the next word out loud. If it starts with a vowel sound, use an. Spelling can mislead you — trust your ear.
The Zero Article
The zero article means no article appears before the noun. This isn't random — it follows clear patterns.
Generic or indefinite plurals and mass nouns:
- Coffee keeps me awake. (mass noun, general reference)
- Cars need fuel. (plural, generic reference)
Certain institutions when used in their typical function:
- She's in hospital. (as a patient — standard in British English)
- He went to prison. (as an inmate)
When you mean the physical building rather than its function, add the:
- ✅ The plumber went to the prison to fix the pipes.
Other common zero-article contexts:
- Meals: Breakfast is ready.
- Years: She was born in 1995.
- Titles as complements: They elected her captain.
Quick Summary
| Article | Use it when… | Example |
|---|---|---|
| the | The listener knows which one | Pass me the salt. |
| a / an | Introducing or generalising (singular, countable) | I need a pen. |
| zero (∅) | Generic plurals, mass nouns, institutions-as-functions, meals, years | Life is short. |
To put these rules into practice, try Articles Basics for core patterns, Articles: A, An, The & Zero Article for broader coverage, or Articles Advanced for trickier cases.
B1 | Intermediate
B1 is the intermediate level of the Common European Framework of Reference for Languages (CEFR). It marks the point where you move beyond survival English and start expressing yourself with real independence — describing experiences, explaining opinions, and handling everyday situations without a script.
What a B1 user can do
At this level, you're expected to:
- Understand the main points of clear, standard speech and writing on familiar topics — work, school, travel, hobbies.
- Handle most travel situations in English-speaking environments.
- Produce simple connected text on topics you know or care about.
- Describe experiences, events, hopes, and plans, and give brief reasons and explanations for your opinions.
- Communicate in routine tasks that require a straightforward exchange of information.
What B1 grammar looks like
B1 is where grammar starts to get more layered. You're not just forming basic sentences anymore — you're combining ideas, using different tenses with more precision, and starting to handle structures like the passive voice, modal verbs for necessity and possibility, and gerunds vs. infinitives. You're also expected to build complex sentences with linking words and dependent clauses.
Typical B1 grammar areas include:
- Future tenses — distinguishing will, going to, and the present continuous for future plans
- Passive voice — The report was written yesterday.
- Modal verbs — You should apply early. / She might be late.
- Used to — I used to live in Berlin.
- Verb patterns — knowing whether a verb takes a gerund, an infinitive, or both (I enjoy reading vs. I decided to leave)
What B1 doesn't mean
B1 speakers still hesitate, make grammatical errors, and sometimes struggle with less familiar topics. That's normal. The key difference from A2 is that you can keep a conversation going and get your point across even when things aren't perfect. The step up to B2 involves handling more abstract topics, understanding nuance, and producing more complex, accurate language.
Self-check: Can you tell a friend about a recent trip — what happened, what you liked, and what you'd do differently — without switching to your native language? If yes, you're likely operating at B1 or above.
Ready to find out where you stand? Try Are you B1/Intermediate? Test your English CEFR Level to figure out!, then build your skills with challenges like Basics. Passive Voice, Basics. Modal verbs, and Used to.
Difficulty: Medium
Medium difficulty. Difficulty levels represent author's opinion about how hard a question or challenge is.