Dans le saladier, Marie bat les œufs avec un fouet.

Yes. French can put a place phrase at the beginning to set the scene or highlight where the action happens.

So these are both possible:

• Dans le saladier, Marie bat les œufs avec un fouet.
• Marie bat les œufs avec un fouet dans le saladier.

The version with Dans le saladier first feels a bit more descriptive or scene-setting.

Because dans does not contract with articles.

French contractions happen with:

• à + le = au
• à + les = aux
• de + le = du
• de + les = des

But with dans, you keep the article separate:

• dans le saladier
• dans la cuisine
• dans les bols

So dans le is the normal form.

You know from the article: le saladier.

In French, nouns have grammatical gender, and you usually learn the noun together with its article:

• le saladier
• un saladier

There is not always a reliable rule based on meaning, so it is best to memorize the noun with le or la.

Le is the definite article, so it refers to a specific bowl, or to the bowl already understood from the context.

• le saladier = the bowl
• un saladier = a bowl

If the bowl were being introduced for the first time with no special context, un saladier could also make sense. But le saladier is very natural when the bowl is already identifiable in the situation.

Bat is the third-person singular present of battre.

Here, the subject is Marie, so French uses the same verb form as it would with elle:

• je bats
• tu bats
• il / elle bat
• nous battons
• vous battez
• ils / elles battent

So Marie bat means Marie beats / is beating.

Also, in pronunciation, the final -t in bat is normally silent.

Les œufs means the eggs: specific eggs, or eggs already understood in the context.

Des œufs would mean some eggs.

So the difference is:

• Marie bat les œufs = Marie is beating the eggs
• Marie bat des œufs = Marie is beating some eggs

In a sentence describing a particular action with known ingredients, les is very natural.

This is a very common question because œuf changes in the plural.

• singular: un œuf → /œf/
• plural: des œufs, les œufs → the final f is not pronounced

In les œufs, there is also a liaison, so the s of les sounds like z before the vowel:

• les œufs → /lez‿ø/

So the important things to remember are:

• singular œuf: pronounced with the f
• plural œufs after an article: no pronounced f
• les œufs has a z sound linking the two words

It is a phrase showing the instrument used for the action.

French often uses avec for with / using a tool:

• écrire avec un stylo
• couper avec un couteau
• battre les œufs avec un fouet

So here avec un fouet tells you what Marie is using to beat the eggs.

Because un introduces the whisk as an indefinite item: a whisk.

• un fouet = a whisk
• le fouet = the whisk

If the whisk had already been mentioned, or if a particular whisk were meant, le fouet could be used. But in a simple description of the action, un fouet is the normal choice.

Not strictly, but it is very natural.

The comma marks a small pause after the introductory place phrase:

• Dans le saladier, Marie bat les œufs avec un fouet.

In short sentences like this, French writers may or may not use the comma, but when the location is placed first, the comma helps separate that introductory phrase from the main clause.