Jag köper potatis, tomater och lök till middagen.

Köper is the present tense of the verb köpa, which means to buy.

• att köpa = to buy
• jag köper = I buy / I am buying

In Swedish, the present tense often ends in -r or -er, depending on the verb.

It can mean both.

Swedish usually uses the simple present form köper for both:

• I buy
• I am buying

The exact meaning depends on context. Unlike English, Swedish usually does not need a separate form like am buying.

Because Swedish often leaves out articles when talking about food or ingredients in a general way, especially in shopping or cooking contexts.

So jag köper potatis, tomater och lök sounds natural in the same way English might say:

• I’m buying potatoes, tomatoes, and onion
• I’m buying some potatoes, tomatoes, and onions

Swedish often does not need a word like some here.

This is a very common learner question.

In this sentence:

• tomater is a clear plural count noun = individual tomatoes
• potatis and lök are being used more like food/ingredient words than counted individual items

So:

• en tomat = a tomato
• tomater = tomatoes

But:

• en potatis = a potato
• potatisar = potatoes
• potatis can also mean potato/potatoes as food in general

And:

• en lök = an onion
• lökar = onions
• lök can also mean onion as an ingredient, not focusing on the exact number

So the sentence is natural even though the forms are mixed.

Yes, you could, but it changes the feel slightly.

• Jag köper potatisar, tomater och lökar sounds more like you are thinking of individual items
• Jag köper potatis, tomater och lök sounds more natural for a shopping list or ingredients for a meal

So the original sentence is the more idiomatic everyday version.

Here, till means for.

So till middagen means for dinner or more literally for the dinner meal.

Even though till often means to, in this sentence it does not show movement. It shows purpose:

• köper ... till middagen = buying ... for dinner

Middagen is the definite form of middag:

• middag = dinner
• middagen = the dinner

Swedish often uses the definite form when talking about a specific expected meal, such as today’s dinner or the dinner we’re about to have.

So:

• till middagen = for the dinner / for dinner

You may also hear till middag, which is also possible, but till middagen often sounds a bit more specific.

The basic word order is:

subject + verb + object/adverbial

So:

• Jag = subject
• köper = verb
• potatis, tomater och lök = object
• till middagen = adverbial phrase

This is the normal word order in a simple Swedish main clause.

Yes. You can say:

Till middagen köper jag potatis, tomater och lök.

That is also correct.

But Swedish main clauses follow the V2 rule, which means the finite verb must stay in the second position. So if you move Till middagen to the front, köper still has to come second:

• Till middagen köper jag ... ✅
• Till middagen jag köper ... ❌

Because Swedish normally does not use a comma before och in a simple list.

So this is standard:

• potatis, tomater och lök

This works very much like standard English without the Oxford comma. The commas separate the earlier items, and och introduces the last one.

A rough guide:

• jag often sounds like ya in everyday speech, though careful speech may keep a weak final g
• ö has no exact English equivalent, but it is somewhat like the vowel in bird or fur, with more rounded lips

A few notes:

• In köper, the k is soft before ö, not a hard English k
• In lök, the ö is the same type of vowel sound

The best way to learn these sounds is by listening to native audio, because English does not match them exactly.