Dans le tunnel, Marie allume les phares et garde les deux mains sur le volant.

Dans le tunnel means inside the tunnel.

French uses dans for being in/inside something:

• dans la voiture
• dans la maison
• dans le tunnel

Au tunnel would usually suggest something like at the tunnel or to the tunnel, not inside it, so it would not fit this sentence.

Dans le tunnel is a time/place setting placed at the beginning of the sentence for context. The comma helps separate that introductory element from the main clause.

So the structure is:

• Dans le tunnel, = setting
• Marie allume les phares et garde les deux mains sur le volant. = main action

You could sometimes see French sentences without such a comma in short phrases, but here the comma is very natural and clear.

Allume is the conjugated form of the verb allumer in the present tense.

The subject is Marie, which is third person singular, so the verb must be conjugated:

• j’allume
• tu allumes
• il/elle allume
• nous allumons
• vous allumez
• ils/elles allument

So Marie allume means Marie turns on / lights.

Allumer by itself is the infinitive, meaning to turn on or to light.

French often uses the definite article (le, la, les) where English would use a possessive like his, her, their.

Here, it is obvious whose headlights they are: the ones of the car Marie is driving. So French naturally says:

• allumer les phares
• not necessarily allumer ses phares

This is very common with body parts and things closely connected to the subject:

• Il lève la main = he raises his hand
• Elle ferme les yeux = she closes her eyes

So les phares sounds normal and idiomatic.

Because a car normally has two headlights, and French refers to them in the plural: les phares.

The singular un phare means a headlight, but when talking about turning them on in normal driving, French usually uses the plural:

• allumer les phares

Here garder means to keep.

So garde les deux mains sur le volant means keeps both hands on the steering wheel.

It does not mean guard here, even though that is related historically. In everyday French, garder often means:

• to keep
• to stay with
• to retain

Examples:

• Garde ton billet. = Keep your ticket.
• Elle garde le silence. = She keeps silent.

In this sentence, garder emphasizes maintaining that position.

Les deux mains means both hands.

French often uses les deux to mean the two / both:

• les deux yeux
• les deux côtés
• les deux mains

If you said only deux mains, it would sound less definite, more like two hands in a general sense. But here we mean the specific pair that belongs to Marie, so les deux mains is the natural choice.

This is another very common French pattern. When the owner is obvious from the context, French often prefers the definite article instead of a possessive adjective.

So French says:

• les mains sur le volant rather than
• ses mains sur son volant

Because Marie is driving, it is obvious which steering wheel is meant.

This is especially common when:

1. the owner is clear from context, and
2. the noun is a body part or something closely linked to the action.

Sur le volant means on the steering wheel, describing where the hands are physically placed.

• sur = on

So:

• les mains sur le volant = the hands are resting on the wheel

Au volant is a different expression meaning at the wheel, that is, driving or in the driver’s position:

• Elle est au volant. = She is at the wheel / she is driving.

So both are correct in French, but they mean different things:

• sur le volant = position of the hands
• au volant = role/position of the driver

Because both verbs have the same subject, Marie.

French often joins two verbs with et and does not repeat the subject if it stays the same:

• Marie allume les phares et garde les deux mains sur le volant.

This is just like English:

• Marie turns on the headlights and keeps both hands on the steering wheel.

You would repeat the subject only for emphasis, contrast, or clarity.

Yes. Allume and garde are both in the present tense.

In French, the present tense can describe:

• what is happening now
• a habitual action
• a general truth
• events in a narrative

So this sentence could mean either:

• something Marie is doing right now, or
• something she does whenever she is in a tunnel

The wider context tells you which interpretation is intended.

Yes, in some contexts you may hear mettre les phares or mettre ses phares, especially in everyday speech, meaning to switch the headlights on.

But allumer les phares is completely standard and very clear. It directly matches the idea of turning on the lights.

So for learners, allumer les phares is an excellent expression to know.