Le contrôleur technique inspecte le châssis.

In French, most adjectives come after the noun. So contrôleur technique literally follows the common French pattern:

• contrôleur = inspector / controller
• technique = technical

So le contrôleur technique means the technical inspector.

Also, this is a very natural expression in French, especially in contexts like vehicle inspection, where contrôle technique is a standard term.

Not exactly. Contrôleur is a word that can mean several things depending on context, such as:

• inspector
• checker
• ticket inspector
• controller

In this sentence, it means something like inspector, not a person who controls things in the general English sense. So this is a good example of a word that may look familiar but does not always match English perfectly.

French normally uses articles more often than English does. Here:

• Le contrôleur technique = the technical inspector
• le châssis = the chassis

So both nouns need their article.

French usually does not leave out the article the way English sometimes can. A bare noun like contrôleur technique inspecte châssis would be ungrammatical.

Inspecte is the present tense form of the verb inspecter.

The infinitive is:

• inspecter = to inspect

But after the subject, you need a conjugated verb:

• j’inspecte = I inspect
• tu inspectes = you inspect
• il / elle / on inspecte = he / she / one inspects

Since le contrôleur technique is a singular third-person subject, the correct form is inspecte.

The subject is le contrôleur technique, which is:

• singular
• third person

So the verb must also be third-person singular in the present tense:

• Le contrôleur technique inspecte...

If the subject were plural, the verb would change:

• Les contrôleurs techniques inspectent le châssis.

So French verbs change form depending on the subject.

Here, technique is an adjective meaning technical.

Compare:

• une technique = a technique / a method → noun
• un problème technique = a technical problem → adjective
• un contrôleur technique = a technical inspector → adjective

So in this sentence, it describes the noun contrôleur.

Châssis is masculine, so it takes le in the singular:

• le châssis

A useful detail: châssis has the same spelling in the singular and plural:

• singular: le châssis
• plural: les châssis

The pronunciation is also typically the same in singular and plural, so only the article clearly shows the number.

A simple approximation is:

• contrôleur ≈ kon-troh-lur
• inspecte ≈ in-spekt
• châssis ≈ sha-see

A few helpful notes:

• ô in contrôleur is pronounced like a closed o
• ch in châssis is pronounced sh, not like English ch in chair
• the final s in châssis is pronounced

So châssis sounds like sha-see.

The little hat accent is called the circumflex:

• ô in contrôleur
• â in châssis

In modern French, the circumflex does not always strongly change pronunciation, but it is part of the correct spelling. It often reflects older historical spelling.

For a learner, the most important thing is:

• learn the word with the accent included
• do not leave it out in careful writing

This sentence follows a very basic French pattern:

• Subject + Verb + Object

So:

• Le contrôleur technique = subject
• inspecte = verb
• le châssis = object

That is the same basic order as in English:

• The technical inspector inspects the chassis.

So even though some parts of French grammar are different, this sentence uses a very familiar structure.

Yes, if the meaning changes.

• Le contrôleur technique inspecte le châssis. = The technical inspector inspects the chassis.
• Un contrôleur technique inspecte un châssis. = A technical inspector inspects a chassis.

So le refers to something definite or already identified, while un introduces something less specific.

Yes, it can be. In many real-world contexts, especially with cars, contrôleur technique refers to the person who carries out the official vehicle inspection.

So even though the sentence is grammatically transparent, it may also sound like a standard occupational title rather than just any technical inspector in a loose sense.