Sitôt que is a fixed phrase that links two actions in time. It means “as soon as” or “no sooner than.” It shows that one action follows another with no delay.

It is used in both spoken and written French, though it has a slightly formal tone. In everyday speech, other phrases are more common.

Meaning and use

Sitôt que introduces a subordinate clause. This clause sets the time for the main clause.

The structure is:

• sitôt que + subject + verb, main clause

The action in the sitôt que clause happens first. The action in the main clause follows right away.

Tense use depends on the time frame:

• present with present for general truths or habits
• future with future for future events
• past with past for completed actions

Examples

• Sitôt que je le vois, je lui parle. “As soon as I see him, I speak to him.”
• Sitôt que tu arrives, appelle-moi. “As soon as you arrive, call me.”
• Sitôt que nous avons fini, nous sommes partis. “As soon as we finished, we left.”
• Sitôt que le film commence, il s’endort. “As soon as the film starts, he falls asleep.”
• Sitôt que j’aurai des nouvelles, je t’écrirai. “As soon as I have news, I will write to you.”
• Sitôt qu’elle a ouvert la porte, le chat est entré. “As soon as she opened the door, the cat came in.”

In careful writing, you may also see inversion after sitôt que, especially in older or formal styles:

• Sitôt eut-il fini, il partit. “No sooner had he finished than he left.”

This form is rare in modern speech.

Origin

Sitôt que comes from two parts:

• si meaning “so”
• tôt meaning “early”

Together, si tôt meant “so early” or “so soon.” Over time, the phrase fused into sitôt, meaning “very soon” or “immediately.” When followed by que, it took on the role of a conjunction meaning “as soon as.”

The spelling reflects this shift:

• si tôt as two words keeps the literal sense “so early”
• sitôt as one word acts as an adverb or part of a fixed phrase

Compare:

• Il est arrivé si tôt. “He arrived so early.”
• Sitôt arrivé, il est reparti. “As soon as he arrived, he left again.”

Register and tone

Sitôt que is correct in all forms of French but tends to sound:

• more formal than everyday speech
• more common in writing than in casual talk

In spoken French, shorter and simpler forms are often preferred.

Synonyms and alternatives

Several phrases can replace sitôt que, depending on tone and context.

Common everyday forms

• dès que
• aussitôt que

Examples:

• Dès que tu arrives, appelle-moi. “As soon as you arrive, call me.”
• Aussitôt qu’il a parlé, tout le monde a ri. “As soon as he spoke, everyone laughed.”

dès que is the most common in daily use.

Slightly formal or literary

• à peine… que
• aussitôt… que (with emphasis)

Examples:

• À peine était-il parti que la pluie a commencé. “No sooner had he left than the rain began.”
• Aussitôt qu’elle entre, il se lève. “As soon as she enters, he stands up.”

Notes on choice

• sitôt que and aussitôt que are close in meaning
• dès que is simpler and more frequent
• à peine… que stresses how little time passes between the two actions

Common patterns

With the present

Used for habits or general facts:

• Sitôt que le soleil se lève, ils partent. “As soon as the sun rises, they leave.”

With the future

French often uses the present in the subordinate clause even when English uses the future:

• Sitôt que tu arrives, nous commencerons. “As soon as you arrive, we will start.”

With the past

Used for completed actions:

• Sitôt qu’il a compris, il a changé d’avis. “As soon as he understood, he changed his mind.”

Summary

• sitôt que means “as soon as” or “no sooner than”
• it links two actions with no gap in time
• it is slightly formal and more common in writing
• it comes from si tôt, meaning “so early”
• common alternatives include dès que and aussitôt que