Learn Icelandic: Ég ábyrgist að við finnum sérhvern gallaðan bíl. - I guarantee that we find every single defective car.

Sérhver declines to match the noun it modifies in gender, number, and case. Here, it modifies bíl (car), which is a masculine noun acting as the direct object (accusative case) of the verb finna (to find). Therefore, it takes the masculine accusative singular form, sérhvern.

What is the exact difference between sérhvern bíl and just hvern bíl?

While hvern bíl means "each car" or "every car", adding the prefix sér- emphasizes the individuality of each item. Sérhver translates best to "every single" or "each and every", which adds a much stronger emphasis to the speaker's guarantee.

Does sérhver take a strong or weak adjective after it?

It takes the strong declension. Even though sérhver might feel specific, it does not act like a definite article (which would require a weak adjective). Because bíl is masculine accusative, the strong adjective gallaður (defective) becomes gallaðan to match sérhvern.

Why does the verb ábyrgist end in -st?