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Ils sont en train de préparer le béton.

Ils sont en train de préparer le béton.
They are currently preparing the concrete.
From Lesson 224:Progressive actions (être en train de)·French

Questions & Answers about Ils sont en train de préparer le béton.

Why use sont en train de préparer instead of just préparent?
In French, the simple present tense Ils préparent usually translates to both "They prepare" and "They are preparing." However, if you want to emphasize that an action is happening right at this very exact moment, you use the phrase être en train de plus an infinitive. It's the equivalent of saying "They are in the middle of preparing."
How exactly is the être en train de structure built in this sentence?
You conjugate the verb être (to be) to match your subject—here, Ils sont (They are). Then you add the fixed phrase en train de, followed by the main action verb in its infinitive (unconjugated) form: préparer.
Why is préparer left in the infinitive instead of being conjugated?
This is a strict rule in French: whenever a verb immediately follows a preposition (in this case, the de in en train de), it must be in the infinitive form. Other common prepositions that trigger this rule include à, pour, and sans.
Does the word train in this sentence have anything to do with railway trains?
Not at all! While un train is a railway train, the idiom être en train de comes from an older meaning of the word related to "motion" or "action." You can think of it literally as "to be in the act of" doing something.

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