Breakdown of Der Fluss ist umso unberechenbarer, als die Sicht sehr gering ist.
sein
to be
sehr
very
der Fluss
the river
umso
the (alternative second part)
als
as (in 'insofern ... als')
unberechenbar
unpredictable
die Sicht
the visibility
gering
low (amount, degree)
Questions & Answers about Der Fluss ist umso unberechenbarer, als die Sicht sehr gering ist.
How does the structure umso ... als work in this sentence?
This is a proportional-causal clause. The phrase umso unberechenbarer means 'all the more unpredictable'. The als introduces the reason why it is more unpredictable. Together, umso [comparative], als... translates to 'all the more [comparative], because...'.
I thought als meant 'than' (for comparisons) or 'when' (for past events). Why is it translated as 'because' here?
You are right about the usual meanings! However, when paired specifically with umso and a comparative adjective, als acts as a causal conjunction. It provides the reason for the increased intensity in the first clause, functioning exactly like 'because' or 'since' in English.
Could I just use weil instead of als in the second half?
You can, but using als directly pairs with umso to create a highly cohesive, fixed grammatical structure. It is an elegant way to express 'all the more so, because...' which is very common in written German at the B2 and C1 levels.
How is the long word unberechenbarer built?
It is the comparative form of unberechenbar (unpredictable). You can break it down into parts: the prefix un- (not), the verb root berechnen (to calculate), and the suffix -bar (-able). Literally, it means 'un-calculatable'. The final -er is the standard comparative ending, making it 'more unpredictable'.
Why does the verb ist go to the very end of the als clause?
Because in this structure, als is a subordinating conjunction. Just like the more familiar conjunctions weil or dass, it forces the conjugated verb (ist) to the very end of the subordinate clause.
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