Prepositions in English: For, Over, Against and More

Some of the shortest words in English cause the longest questions. Is for a preposition? Is over? What about against? The questions come up because these words look so small and behave so differently from nouns and verbs. They have almost no meaning on their own, yet a sentence falls apart without them. I waited ___ an hour needs a word in that gap, and the right choice is for. The rain hit ___ the window needs one too, and against fits. This guide explains what a preposition is, how to recognize one, and what the three words in the title do.

What a preposition does

A preposition links a noun, a pronoun or a noun phrase to the rest of the sentence. Linguists describe prepositions as one kind of adposition, a class of words that connect a complement to the rest of a sentence. In English the preposition comes before its complement, which is why the name has the Latin prefix pre-, "before". The preposition plus its complement forms a prepositional phrase: in the kitchen, after dinner, for my sister.

What does the link say? Usually one of three things:

• Place or direction: in, under, behind, into, across. The keys are under the book.
• Time: after, during, before, since. We met after the concert.
• A relationship that is neither place nor time: of, for, via, with. A letter for you.

A prepositional phrase can do several jobs. It can describe a noun (the book on the table), add detail to a verb (she waited for an hour) or modify an adjective (afraid of spiders). It can also follow a form of be and complete the sentence on its own: The meeting is after lunch.

How to spot a preposition

Three quick checks help when you are unsure.

The noun test. A preposition is followed by a noun, a pronoun or a noun phrase. If you can put the or it after the word and the phrase makes sense, you are probably looking at one. For it works. Against the wall works.

The substitution test. Prepositions come in families, so you can swap one for another and see the meaning change. The book is on the table, under the table, beside the table. Words that swap in the same slot are doing the same job.

The position test. A preposition normally stands before its complement, but English also allows it to be left at the end of a question or clause: What did you sit on? and Who are you waiting for? This is called preposition stranding, and it is common in everyday English. The preposition is still a preposition even when it ends up at the end.

Another sign is that prepositions form a small, closed group. English invents new nouns and verbs all the time, but a new preposition almost never appears. That is why learners can realistically learn the common ones one by one.

Is "for" a preposition?

Yes. In nearly every sentence you will meet, for is a preposition. Wiktionary lists its main senses, and a handful cover almost everything you will read or say:

• Purpose or use: This medicine is for your cough.
• Benefit: We are having a party for Janet.
• Duration: I have lived here for three years.
• Exchange: I got five hundred pounds for that old car.
• Support: Who is for ice cream? (meaning, who is in favor of it)
• Direction: Run for the hills!
• Standard of comparison: She is spry for an old lady.

Notice that the same small word can answer different questions: why (purpose), who benefits, how long, in exchange for what. When you are not sure which sense a sentence needs, ask which question it is answering.

There is one case where for is not a preposition. The same entry lists for as a conjunction too. In that use it joins two clauses and gives a reason, much like because, and it sounds formal or literary: He did not answer, for he had not heard. A quick test settles it. If what follows for is a whole clause with its own subject and verb (he had not heard), it is the conjunction. If it is a noun phrase (for an hour, for you), it is the preposition.

Over: more than "above"

Over is another word that learners often class as one thing when it is several. It can be a preposition, an adverb, an adjective, a noun and more, and the preposition alone has a wide range:

• Above: Hold the sign over your head.
• Across: The guide took us over the border.
• More than: He is over a hundred years old.
• During: I will have to work over the weekend.
• About, concerning: The two boys had a fight over whose turn it was.
• Control or authority: The prince ruled over a part of the kingdom.
• Finished with a problem: We got over the engineering problems.

When over is not followed by a complement, it often stops being a preposition. The game is over uses it as an adjective. Come over and take over use it as part of a phrasal verb, and phrasal verbs with take shows how much meaning such a pairing can carry. The test is the same as before: a preposition has something after it that it links to the sentence.

Against: opposition and contact

Against is a preposition in almost every use. Its senses fall into a few families:

• Opposite direction: It is hard work to swim against the current.
• Opposition to a person or idea: Are you against the proposal?
• Competition: The Tigers will play against the Bears this weekend.
• Contrary to a rule: Doing that is against my principles.
• Contact or support: The ladder was leaning against the wall.
• Background: The giant was silhouetted against the door.
• Protection or preparation: The stores are kept well stocked against a time of need.

The dictionary entry counts seventeen numbered senses in all, which is a useful reminder that no preposition is a single meaning. You learn each one through the phrases it appears in, not through a definition.

Why learners get prepositions wrong

Prepositions are hard because they rarely translate neatly. English says depend on and interested in, where another language may use a different word for each. The choice often has little to do with logic. We are in a car but on a bus, at the weekend in British English and on the weekend in American English.

Three habits help.

1. Learn the combination, not the word. Write good at, afraid of, wait for, different from, not just the adjective or verb. This is the same idea behind learning collocations, where words are stored with the partners they usually take.
2. Read examples, not rules. A rule that says for marks duration is less useful than five sentences you have actually seen with for three years, for a while, for hours.
3. Notice the pairs that clash. Since and for both talk about time, but since points to a starting point (since Monday) and for to a length (for two days). Putting the two side by side in your notes fixes the difference faster than a rule does.

If you also want a wider map of how words sort into classes, the parts of speech guide shows where prepositions sit beside nouns, verbs and conjunctions.

Practice set

Choose the best word for each gap: for, over, against or since.

1. We have been waiting ______ forty minutes.
2. She has lived in Lisbon ______ 2019.
3. He leaned his bike ______ the garden wall.
4. The two companies argued ______ the price.
5. Are you ______ or ______ the new schedule?
6. The temperature stayed ______ thirty degrees all week.
7. Decide whether for is a preposition or a conjunction: She stayed home, for she was ill.
8. Decide again: She stayed home for a week.

Answers: 1. for (a length of time). 2. since (a starting point). 3. against (contact). 4. over (about, concerning). 5. for, against. 6. over (more than). 7. Conjunction: a whole clause follows and for means because. 8. Preposition: a noun phrase follows and it gives a duration.

Making it stick

Prepositions are learned by exposure. A short review every day, with the partner phrase on the card and one sentence of your own, builds the feel for them much faster than a long list. Spaced review is ideal for this, and how spaced repetition works explains why seeing a phrase again just before you would forget it is so effective. In the end the goal is not to recite senses but to hear that waited for an hour sounds right and waited since an hour does not.

How Wordabulary fits in

Wordabulary finds your level with a placement assessment, then gives you practice and quizzes matched to it. Every word page shows the definition, example sentences and the partners a word usually takes, and you can listen to each word in British or American English. Reading the phrases around a word, not only the word, is how prepositions start to feel natural.