How to use "weil" properly

Question

I want to say: because aerospace is my favorite area/field, therefore...

Is there any difference between these two sentences?

Weil meine Lieblingsgebiete/felder Luft und Raumfahrt sind, deshalb...

or

Weil Luft und Raumfahrt meine Lieblingsgebiete/felder sind, deshalb...

The first part in both sentences are fine (Lieblingsgebiet is a noun and has to be written with a capital L), but the deshalb sounds strange. — raznagul, Jan 29 '16 at 09:36
@chirlu I'm sure this has been asked a handful of times, being indeed a dupe, but the link you gave is not the right one. — c.p., Jan 29 '16 at 09:41
I agree with @c.p. and add that I think that the same holds for “because” and “therefore”. — Carsten S, Jan 29 '16 at 09:50
@raznagul Z.B : deshalb ich lerne Luft und Raumfahrttechnik... does it still sound strange ?. — snow patrol, Jan 29 '16 at 10:38
In your specific example I would use "da" instead of "weil". It's not wrong though, just sounds better in my opinion. Just like "because" and "since" — Jens, Jan 30 '16 at 21:44

score 9 · Accepted Answer · edited Apr 13 '17 at 12:42

Both cojunctions deshalb and weil are used to initiate a causal clause:

Ich bin müde, weil ich nicht genug geschlafen habe.
Ich habe nicht genug geschlafen, deshalb bin ich müde.

In these examples we use one or the other. Sentence order does not matter for weil, as we can also say:

Weil ich nicht genug geschlafen habe, bin ich müde.

However, different to weil putting deshalb at the beginning of a sentence would be very unusual.

For emphasis we can also combine the use of deshalb and weil. If we do then deshalb must be correlated with a weil sentence.

Ich bin deshalb müde, weil ich nicht genug geschlafen habe.

So in case you want to use both in your example sentence it could go like this:

Mein Lieblingsgebiet ist deshalb Luft- und Raumfahrttechnik, weil mein Vater Astronaut ist.

Also see:

Darum lieb ich alles was so grün ist, weil mein Schatz ein Jäger ist – Unusual indeed, but not impossible, at least in lyrics. Note that you can usually substitute darum and deshalb for each other when used as conjunctions, but ich bin ?darum müde, weil … would be questionable at least. — Crissov, Jan 30 '16 at 09:36

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