Mein Vater arbeitet im Werk.

Because Vater is a masculine noun in German, and in the nominative case the possessive adjective takes the form mein.

• mein Vater = my father
• meine Mutter = my mother

So the ending changes depending on the gender and case of the noun.

In German, all nouns are capitalized, not just proper names.

So:

• Vater is capitalized because it is a noun.
• Werk is also capitalized for the same reason.

This is one of the most noticeable differences from English spelling.

Because the subject is mein Vater, which is third person singular (he).

The verb arbeiten means to work, and its present-tense forms are:

• ich arbeite
• du arbeitest
• er/sie/es arbeitet
• wir arbeiten
• ihr arbeitet
• sie/Sie arbeiten

Since mein Vater = he, the correct form is arbeitet.

Im is a contraction of in dem.

• in dem → im

This contraction is extremely common in German and is usually the normal way to say it.

So:

• im Werk = in the factory/plant/works

German often contracts:

• an dem → am
• in dem → im
• zu dem → zum
• zu der → zur

Werk is in the dative case here.

The preposition in can take either:

• accusative for movement toward a place
• dative for location

Here the sentence describes where the father works, not movement, so German uses the dative:

• im Werk = in the factory / at the plant

Because Werk is neuter (das Werk), the dative singular article is dem, which becomes im after in.

In this sentence, Werk usually means a factory, plant, or industrial works.

Depending on context, Werk can also mean:

• a work of art or literature
• a piece of work
• an industrial facility

But in arbeitet im Werk, the most natural meaning is something like:

• He works at the factory
• He works in the plant

German main clauses usually follow the verb-second rule.

In this sentence:

• Mein Vater = first element
• arbeitet = second element
• im Werk = the rest

So the structure is:

• Subject + verb + other information

That is the normal word order in a simple statement.

Yes, that is grammatically correct.

However, im Werk is much more natural in everyday German because in dem is usually contracted to im.

So:

• Mein Vater arbeitet im Werk. = natural, standard
• Mein Vater arbeitet in dem Werk. = correct, but more explicit or marked

You might use in dem Werk when you want extra emphasis, contrast, or clarity.

Yes. arbeitet is normally pronounced as three syllables:

• ar-bei-tet

This happens because verbs ending in -t or -d often add an extra vowel sound in certain forms:

• arbeiten
• du arbeitest
• er arbeitet

That extra syllable makes pronunciation easier.

Yes. German often uses in where English might use either in or at, depending on context.

So Mein Vater arbeitet im Werk could be translated naturally as:

• My father works in the factory
• My father works at the factory

English chooses between in and at more flexibly, while German simply uses im Werk here.

Because mein already works like a determiner, similar to my in English.

In German, you normally do not combine a possessive like mein with a definite article like der in a basic phrase.

So:

• mein Vater = my father
• not der mein Vater

This is similar to English:

• my father
• not the my father