Learn Hardcore Swedish: Vi fortsätter imorgon, men det beror på vädret. - We will continue tomorrow, but it depends on the weather.

Neutral: Vi fortsätter imorgon.
Plan/intention: Vi ska fortsätta imorgon.
Prediction/neutral: Vi kommer att fortsätta imorgon. All three are correct; nuance is minor in everyday speech.

What does det refer to in men det beror på …? Why is it needed?

Here det is a dummy subject that points to the situation as a whole. Swedish requires a subject in such clauses, so you cannot say men beror på vädret in a full sentence. In short answers, you can omit it: Beror på vädret.

Why is it vädret (definite) rather than väder?

Swedish normally uses the definite form when you mean the concrete, specific weather that will occur: vädret. The bare väder is used in general statements, not in this kind of dependence.

Natural: Det beror på vädret.
Unnatural here: Det beror på väder.
Generic statement: Väder påverkar humöret.

Why the preposition på after beror? Could it be av?

The verb bero takes på for the thing something depends on: Det beror på vädret.
The adjective beroende often takes av when it means dependent/addicted: Hon är beroende av kaffe.
As a prepositional-like phrase, beroende på = depending on: Beroende på vädret stannar vi. Using bero på is the standard verb pattern; bero av is not used in modern standard Swedish for this meaning.

Can I front the time word? Is the word order still correct?

Yes. Swedish has verb-second word order, so the finite verb stays in second position:

Imorgon fortsätter vi, men det beror på vädret. You can also keep imorgon later in the clause, as in the original.

Where does inte go?

In main clauses, inte typically comes after the finite verb:

Vi fortsätter inte imorgon, men det beror inte på vädret. If you front the time word, the verb remains second and inte follows the subject:
Imorgon fortsätter vi inte.

Do I need the comma before men?

It is customary (and recommended) to put a comma between two main clauses joined by men:

Vi fortsätter imorgon, men det beror på vädret. In very short clauses some writers omit it, but the comma is clear and standard here.

Is it imorgon or i morgon (or even i morrn)?

imorgon and i morgon are both standard and accepted.
i morrn / i morron are colloquial spellings that reflect common pronunciation; avoid them in formal writing.

Any pronunciation tips for tricky parts?

fortsätter: In many accents, rt merges into a single retroflex sound; ä is like the vowel in English bed; tt is long and clearly doubled. Main stress on -sät-.
imorgon: Often pronounced like i morron in casual speech.
det: Commonly pronounced de; in det är you’ll hear de e.
vädret: ä as in bed; the final t is pronounced.

What are the key forms of fortsätta?

Infinitive: att fortsätta
Present: fortsätter
Preterite: fortsatte
Supine: fortsatt (e.g., har fortsatt)
Imperative: fortsätt!
Participle: fortsatt (e.g., den fortsatta diskussionen)

How does bero conjugate?

Infinitive: att bero
Present: beror
Preterite: berodde
Supine: berott (rare but correct: det har berott på …)
Present participle: beroende

Can I say Det beror på att …?

Yes, but note the meaning:

Det beror på att … = That is because … (states a cause). Example: Det beror på att det regnar.
For conditional dependence, use om or hur: Det beror på om det regnar / hur vädret blir.

Can I use beroende på to rephrase the sentence?

Yes:

Beroende på vädret fortsätter vi imorgon.
Vi fortsätter imorgon, beroende på vädret. This is idiomatic. In very formal writing, some prefer clearer conditionals like om vädret tillåter.

Are there synonyms for det beror på?

Det hänger på vädret. (informal)
Det avgörs av vädret. (more formal/deterministic)
Conditional rephrases: om vädret tillåter, om det är bra väder.

Can I start a new sentence with Men?

Yes. Starting a sentence with Men is common for contrast:

Vi fortsätter imorgon. Men det beror på vädret. Keeping it as one sentence with a comma is also perfectly fine.