Breakdown of Warum bist du so launenhaft, wenn wir einkaufen?
sein
to be
du
you (informal singular)
wir
we
einkaufen
to shop
Questions & Answers about Warum bist du so launenhaft, wenn wir einkaufen?
How does the suffix -haft change the meaning of die Laune in this sentence?
The noun die Laune means "mood" or "whim." Adding the suffix -haft turns it into the adjective launenhaft, meaning "moody," "capricious," or "temperamental." The suffix -haft generally describes having the character or quality of the root noun. Notice that an extra -n- is inserted as a linking letter here: Laune + n + haft.
Could I use the suffix -mäßig here and say launenmäßig instead?
No, that would sound unnatural and change the meaning entirely. The suffix -haft describes an inherent trait or behavior (being a moody person). The suffix -mäßig usually means "in terms of" or "regarding." If someone were to say launenmäßig, it would mean something like "in terms of mood" rather than describing someone who acts moody.
Why is wenn used here instead of wann for the English word "when"?
Wann is strictly a question word used to ask for a specific time (like "When are we going?"). In this sentence, "when" actually means "whenever." For repeated events in the present or future, or for conditional "if/when" statements, you must use the subordinating conjunction wenn.
Einkaufen is a separable verb. Why isn't the prefix separated from the main verb here?