Questions & Answers about Sooft mein Telefon klingelt, ist es ein Werbeanruf.
Why use sooft here instead of immer wenn?
Both mean "whenever" or "every time that" and are often interchangeable. However, sooft places a slightly stronger emphasis on the sheer frequency of the event (literally "as often as"), whereas immer wenn is a bit more neutral. In this sentence, both are perfectly natural.
Why does the main clause start with the verb ist instead of the subject es?
This is due to the German verb-second (V2) rule. The entire subordinate clause (Sooft mein Telefon klingelt) counts as a single block of information occupying the first position in the sentence. To keep the main verb in the second position, ist must immediately follow the comma, pushing the subject (es) to the third position.
How is the compound noun Werbeanruf formed?
It combines die Werbung (advertising) and der Anruf (phone call). When these are joined, the suffix -ung drops its final consonants and becomes an -e-, acting as a linking letter. As always, the gender of the compound word comes from the final noun, making it der Werbeanruf.
Why is it ein Werbeanruf and not the accusative einen Werbeanruf?