Wir fahren morgens weg.

Because the verb here is wegfahren, which is a separable verb in German.

• wegfahren = to leave/depart by vehicle, drive off, set off
• In a normal main clause, the prefix weg- separates and goes to the end:
  • Wir fahren morgens weg.

This is very common in German:

• Ich stehe früh auf. = I get up early.
• Er kommt heute an. = He arrives today.

So the basic dictionary form is wegfahren, but in this sentence it appears as fahren ... weg.

Here, weg adds the idea of away or off.

So fahren by itself means to drive / go / travel, but wegfahren means something more like:

• to leave
• to drive away
• to set off
• to depart

In this sentence, weg does not just mean away in an independent sense; it is part of the separable verb wegfahren.

In a standard German main clause, the finite verb must come in second position. This is often called the V2 rule.

In Wir fahren morgens weg:

1. Wir
2. fahren
3. morgens
4. weg

So fahren is second, which is exactly what German expects in a main clause.

Because weg- is the separable prefix of wegfahren.

In a main clause:

• the conjugated verb part goes in position 2
• the separable prefix goes to the end

So:

• infinitive: wegfahren
• main clause: Wir fahren ... weg

This is one of the most important patterns to get used to in German.

morgens means in the morning or in the mornings, depending on context.

The -s form is very common in adverbs of time:

• morgens = in the morning / in the mornings
• abends = in the evening / in the evenings
• nachts = at night / at nights

So morgens here is an adverb, not a noun.

Compare:

• am Morgen = in the morning
• morgens = in the morning / mornings

Both are possible, but morgens is often more compact and natural in everyday speech.

It can mean either, depending on context.

• habitual: We leave in the mornings
• this occasion / planned event: We’re leaving in the morning

German often leaves that distinction to the context. The sentence by itself could be understood either way.

German very often uses the present tense to talk about the future, especially when the time is clear from context.

So Wir fahren morgens weg can mean:

• We leave in the morning
• We’re leaving in the morning

This is completely normal German. You do not need a special future form every time.

German does have a future construction with werden, but it is often unnecessary:

• Wir werden morgens wegfahren.

That is grammatically correct, but the simple present is often more natural.

Because wir takes the same present-tense verb ending as the infinitive stem form: -en.

For fahren in the present tense:

• ich fahre
• du fährst
• er/sie/es fährt
• wir fahren
• ihr fahrt
• sie/Sie fahren

So with wir, the correct form is fahren.

Both can relate to leaving, but they are not the same.

• gehen = to go, to walk, sometimes to leave
• wegfahren = to leave by vehicle / to set off / to drive away / to depart

So Wir fahren morgens weg suggests travel involving a vehicle or a trip, not just physically walking away.

For example:

• Wir gehen jetzt. = We’re leaving now.
• Wir fahren morgen weg. = We’re going away tomorrow / leaving on a trip tomorrow.

Yes. That is also correct.

German word order is flexible as long as the finite verb stays in second position.

Compare:

• Wir fahren morgens weg.
• Morgens fahren wir weg.

Both are grammatical. The difference is mainly emphasis:

• Wir fahren morgens weg. → neutral, starting with we
• Morgens fahren wir weg. → emphasizes in the morning

Not always in a narrow sense. It often means to leave on a trip or to depart, even if English would not always say drive.

Depending on context, it can suggest:

• leaving by car
• setting off by some form of transport
• going away on a trip

So in many situations, the best English translation is simply:

• to leave
• to go away
• to set off

rather than literally to drive away.

In a subordinate clause, the separable verb does not split. The full infinitive-like form stays together at the end.

Example:

• ..., weil wir morgens wegfahren.
  = ... because we’re leaving in the morning.

So compare:

• main clause: Wir fahren morgens weg.
• subordinate clause: ..., weil wir morgens wegfahren.

This contrast is very important with separable verbs.

In wir fahren, the verb is pronounced with a long a sound: fahren.

Only some forms change their vowel:

• du fährst
• er fährt

But:

• wir fahren
• sie fahren

So in this sentence, there is no umlaut in the verb form.

That is a common pattern with strong verbs in German:

• stem change in du and er/sie/es
• no stem change in wir, ihr, and sie/Sie except where regular endings apply.