Paul prépare le dîner, tandis que Marie met la table.

In French, meals usually take the definite article: le petit déjeuner, le déjeuner, le dîner.

So French normally says:

• Je prépare le dîner
• Nous prenons le déjeuner à midi

English often drops the article in this kind of sentence, but French usually keeps it.

Yes, literally mettre means to put, so mettre la table looks strange to an English speaker.

But as an expression, mettre la table means to set the table.

So:

• Marie met la table = Marie is setting the table

You may also hear dresser la table, which also means to set the table, but mettre la table is very common in everyday French.

Tandis que means while, and sometimes it can also carry a slight sense of whereas or at the same time that.

In this sentence, it links two actions happening at the same time:

• Paul is preparing dinner
• Marie is setting the table

So tandis que shows simultaneity, and it can also gently highlight the contrast between what each person is doing.

Both can mean while.

• pendant que usually just emphasizes that two actions happen at the same time
• tandis que can also suggest a contrast between the two clauses

In this sentence, tandis que works well because the two people are doing different but related tasks.

Compare:

• Paul prépare le dîner pendant que Marie met la table
  = focuses mainly on the time overlap

• Paul prépare le dîner, tandis que Marie met la table
  = also slightly highlights that Paul does one thing and Marie does another

In many everyday contexts, either one could work.

This comes from the verb préparer (to prepare).

In the present tense, it is:

• je prépare
• tu prépares
• il/elle prépare
• nous préparons
• vous préparez
• ils/elles préparent

The accent is part of the normal spelling of the verb in these forms. French keeps the written accent because it affects pronunciation.

So Paul prépare is simply the third-person singular present form: Paul prepares / Paul is preparing.

This is because mettre is conjugated differently depending on the subject.

Present tense:

• je mets
• tu mets
• il/elle met
• nous mettons
• vous mettez
• ils/elles mettent

Since the subject is Marie = she, French uses the il/elle form:

• Marie met

A useful thing to know: mets and met are pronounced the same in standard French, so the difference is mainly visible in writing.

Yes, French could use a pronoun, but each clause still needs its own subject.

Here the full names are used for clarity:

• Paul prépare le dîner, tandis que Marie met la table.

You could also say:

• Paul prépare le dîner, tandis qu’elle met la table.

But that only works if it is already completely clear who elle refers to.

French usually requires an explicit subject in each clause, unlike English, which sometimes feels more flexible stylistically.

Yes, it is in the present tense.

French present tense often covers both of these English ideas:

• Paul prepares dinner
• Paul is preparing dinner

and

• Marie sets the table
• Marie is setting the table

In this context, the natural English meaning is usually the ongoing one: is preparing / is setting.

The comma is very natural here because the sentence joins two full clauses:

• Paul prépare le dîner
• tandis que Marie met la table

It helps separate the two parts clearly, especially since tandis que introduces a contrast or parallel action.

In French punctuation, this comma is common and natural in a sentence like this.

Yes. French can put either clause first.

For example:

• Tandis que Marie met la table, Paul prépare le dîner.

This means the same thing overall. The difference is mostly one of emphasis or style.

If you begin with tandis que, a comma after the first clause is especially expected.

Yes. French can say:

• Paul est en train de préparer le dîner

This means Paul is in the middle of preparing dinner and emphasizes that the action is happening right now.

But in normal French, the simple present prépare is often enough. French does not need a special progressive form as often as English does.

So:

• Paul prépare le dîner = perfectly natural
• Paul est en train de préparer le dîner = more emphatic about the ongoing action