syuumatu ha suupaa de ringo to banana wo kaimasu.

は marks 週末 as the topic of the sentence.

So 週末は means something like:

• as for the weekend
• on weekends
• when it comes to the weekend

In this sentence, it gives a sense like On weekends, (I) buy apples and bananas at the supermarket.

A learner might also wonder why it is not 週末に. That is also possible in some contexts:

• 週末にスーパーでりんごとバナナを買います。

Using に makes 週末 sound more like a straightforward time marker: at/on the weekend.
Using は makes it the topic, and can add a slight contrastive feeling, like On weekends, ...

By itself, it can be understood either way depending on context.

Because 買います is a non-past form, the sentence could mean:

• I buy apples and bananas at the supermarket on weekends.
  or
• I will buy apples and bananas at the supermarket this weekend.

Without more context, many learners read 週末は as a general habit: On weekends...
If the speaker clearly means one specific upcoming weekend, the surrounding conversation usually makes that clear.

で marks the place where an action happens.

Here, the action is 買います (buy), and that action happens at the supermarket:

• スーパーで = at the supermarket

This is a very common use of で:

• 学校で勉強します。 = study at school
• レストランで食べます。 = eat at a restaurant

So in this sentence, スーパーで tells you where the buying happens.

と connects nouns and means and.

So:

• りんごとバナナ = apples and bananas

A useful point: と usually sounds like a complete list.
It suggests these are the items being named directly.

If you wanted a looser, non-exhaustive list like apples, bananas, and maybe other things, Japanese often uses や instead:

• りんごやバナナを買います。

So と is the normal choice for a clear A and B list.

Because りんごとバナナ is treated as one combined object phrase.

The whole object is:

• りんごとバナナ = apples and bananas

Then を marks that whole phrase as the direct object of 買います:

• りんごとバナナを買います。 = buy apples and bananas

You do not need:

• りんごをとバナナを ✘

That would be unnatural here.

を marks the direct object of the verb.

The verb is 買います (buy), and the thing being bought is:

• りんごとバナナ

So:

• りんごとバナナを買います。 = buy apples and bananas

A pronunciation note: the particle を is usually pronounced simply as o, even though it is written with the kana を.

Japanese sentences often place the main verb at the end.

That is one of the biggest word-order differences from English.

English:

• I buy apples and bananas at the supermarket on weekends.

Japanese:

• 週末は スーパーで りんごとバナナを 買います。

A rough pattern is:

• time + place + object + verb

Japanese is flexible in some ways, but the verb usually comes at or near the end.

買います is the polite non-past form of the verb 買う (to buy).

Important points:

• dictionary form: 買う
• polite form: 買います
• negative polite: 買いません
• past polite: 買いました

The non-past form in Japanese can express:

• present habitual action: I buy
• future action: I will buy

So 買います does not mean only present tense. Context decides whether it is habitual or future.

Yes, it very naturally can mean I buy, but the subject is omitted.

Japanese often leaves out subjects when they are obvious from context.
So this sentence could mean:

• I buy apples and bananas at the supermarket on weekends.
• We buy apples and bananas at the supermarket on weekends.
• sometimes even they buy..., if the context already makes that clear

In beginner translations, it is often rendered as I buy..., because that is the most natural default in many situations.

Japanese uses multiple writing systems together.

In this sentence:

• 週末 is in kanji
• は, で, と, を are in hiragana
• スーパー and バナナ are in katakana
• りんご is in hiragana

Why?

• katakana is commonly used for foreign loanwords, so スーパー and バナナ are written that way.
• hiragana is used for grammatical particles like は, で, と, を.
• kanji is often used for core vocabulary like 週末.

A learner may ask why りんご is not in kanji. It actually can be written as 林檎, but that kanji is much less common in everyday writing, so りんご in hiragana is very normal.

This is a special feature of the topic particle.

When は is used as a particle, it is pronounced wa, not ha.

So:

• 週末は is pronounced しゅうまつ wa

But when は is part of a regular word, it is usually pronounced ha.

This is just something learners need to memorize for particles.

Yes. For example:

• 週末、スーパーでりんごとバナナを買います。

That is also natural.

Japanese time expressions are often used without a particle, especially common ones like:

• 今日
• 明日
• 週末

Compared with 週末は, the version without は feels a bit more neutral and less topic-focused.

So these are all possible, depending on nuance:

• 週末は... = As for the weekend / On weekends...
• 週末に... = On the weekend...
• 週末... = simple time expression, often very natural in conversation

Yes, to some extent.

Japanese word order is more flexible than English, as long as the particles still show each word’s role. For example, these can still be understandable:

• スーパーで週末はりんごとバナナを買います。
• りんごとバナナを週末はスーパーで買います。

However, not all orders sound equally natural in every context.

The original sentence:

• 週末は スーパーで りんごとバナナを 買います。

is a very clear and natural beginner-friendly order: topic/time → place → object → verb.

Yes. スーパー is the normal shortened form of スーパーマーケット.

Both mean supermarket, but スーパー is much more common in everyday speech.

So:

• スーパーで買います。 = buy at the supermarket

is perfectly natural Japanese.