There is no simple explanation. What kind of words are you talking about? subject, verb, object is normal word order but it can be changed to object verb subject. Verb is always at the second place. Then there are adverbs which have this order: Temporale (wann?), kausale (warum?), modale (wie?) und lokale (wo?) for example: Er lag heute Morgen wegen Urlaub lange im Bett. wann? heute Morgen warum? wegen Urlaub wie? lange wo? im Bett You can also say, "heute Morgen lag Er heute Morgen wegen Urlaub lange im Bettt." taking any of these to the first place. The rest of the order remains the same. Again, the verb must always remain at the second place.

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