Learn Hardcore German: Heute Abend gehen wir ins Theater, denn ein neues Stück beginnt um acht. - This evening we are going to the theater, because a new play starts at eight.

German main clauses follow the V2 rule: the finite verb must be in second position. When you front a time phrase like Heute Abend, the subject wir moves after the verb: Heute Abend gehen wir .... The neutral order is Wir gehen heute Abend ....

Can I say Heute Abend wir gehen ins Theater?

No. After fronting Heute Abend, the verb must immediately follow to satisfy V2: Heute Abend gehen wir ....

What exactly is ins?

A contraction of in das. Here in is the preposition and das is the neuter accusative article for Theater. So ins Theater = in das Theater.

Why ins Theater and not im Theater?

ins (in + accusative) expresses motion into a place; im (in + dative) expresses location.

Wir gehen ins Theater. (motion, going in)
Wir sind im Theater. (location, being inside)

What case does in take here, and why?

Accusative, because it indicates direction/motion. Two-way prepositions like in take:

Accusative for motion: ins Theater gehen
Dative for location: im Theater sein

Why is the article for Theater neuter?

Because Theater is grammatically neuter: das Theater. You learn noun genders from a dictionary; they’re not usually predictable from meaning.

Is the comma before denn required?

Yes. Denn is a coordinating conjunction linking two main clauses, and German requires a comma before it. (With und/oder the comma can often be omitted; not with denn/aber/sondern.)

Does denn change word order the way weil does?

No. Denn is coordinating and keeps normal main-clause V2: ..., denn ein neues Stück beginnt um acht.
Weil is subordinating and sends the verb to the end: ..., weil ein neues Stück um acht beginnt.

When should I use denn vs weil (or da)?

weil: most common “because” in speech; verb-final.
denn: more neutral/written; links two main clauses; not used as a standalone answer to “Warum?”.
da: “since/as (because)”; slightly more formal; often placed first: Da um acht ein neues Stück beginnt, ...
All express cause; the choice is stylistic and affects word order.

Can I move um acht earlier in the second clause?

Yes. Both are correct:

..., denn ein neues Stück beginnt um acht.
..., denn um acht beginnt ein neues Stück.

Do I have to say um acht Uhr, or is um acht fine?

Both are fine. um acht is common in speech; um acht Uhr is a bit more explicit/formal. Given Heute Abend, it clearly means 20:00. You can also say um 20 Uhr.

What does Stück mean here? Is Theaterstück better?

das Stück literally means “piece,” but in a theater context it commonly means “play.” das Theaterstück is more explicit but not necessary; ein neues Stück is idiomatic.

Why ein neues Stück and not ein neue Stück?

Because Stück is neuter. After the indefinite article in the nominative singular, adjective endings are:

masculine: ein neuer
neuter: ein neues
feminine: eine neue
Hence: ein neues Stück.

Is beginnt the right verb? Could I use fängt an?

Yes. beginnen and anfangen are near-synonyms. With anfangen (separable), you’d say: ..., denn ein neues Stück fängt um acht an.

Is Heute Abend capitalized correctly?

Yes. heute is normally lowercase but is capitalized at the start of a sentence. Abend is a noun and is always capitalized. Inside a sentence: heute Abend.

What’s the difference between heute Abend and abends?

heute Abend = this evening/tonight (one specific evening)
abends = in the evenings (habitual). You wouldn’t say heute abends.

Could I say zum Theater instead of ins Theater?

Not if you mean attending a performance. ins Theater gehen is the idiomatic expression for “go to the theater (to see a play).” zum Theater focuses on going to the building/area and doesn’t imply going inside to watch a play.

Why wir and not uns?

wir is nominative (subject). uns is accusative/dative (object). Here “we” is the subject of gehen.

If I drop wir and say Gehen wir ins Theater, what happens?

Verb-first makes it either a yes/no question (Gehen wir ins Theater?) or a first-person plural imperative (Gehen wir ins Theater!, roughly “Let’s go to the theater!”; more commonly Lass uns ins Theater gehen!).

Why um and not am with the time?

um
- clock time: um acht (Uhr)
am
- days/dates/parts of day: am Abend, am Montag
  So: heute Abend ... um acht.

Is the denn here the same as the particle in Was machst du denn??

Same spelling, different function. Here denn is a coordinating conjunction meaning “because/for.” In Was machst du denn?, denn is a modal particle that adds a softening/curious tone and doesn’t affect word order.

After denn, can I start with the verb or put multiple elements before it?

No. The clause after denn must still be V2.

Wrong: ..., denn beginnt ein neues Stück um acht. (verb-first)
Wrong: ..., denn ein neues Stück um acht beginnt. (verb-third)
Correct: ..., denn ein neues Stück beginnt um acht.
Also correct: ..., denn um acht beginnt ein neues Stück.

Is ..., weil ein neues Stück beginnt um acht correct?

No. With weil, the finite verb must go to the end:
Use ..., weil um acht ein neues Stück beginnt or ..., weil ein neues Stück um acht beginnt.

Why have both Heute Abend and um acht? Isn’t that redundant?

They complement each other: heute Abend sets the general time frame (tonight), and um acht gives the exact clock time within that frame. German commonly stacks broader and narrower time phrases.

How do I pronounce Theater and Stück?

Theater: three syllables, roughly “te-AH-ter”; the th is just [t] in German, not an English “th.”
Stück: short rounded ü ([ʏ], like a rounded “i” in “sit”), final “shtyook” (with a very short vowel).