Question: The verbs of most aspect pairs differ in one of two ways: by prefix or by suffix. In prefix pairs, the perfective verb has an added prefix—for example, the imperfective psát (to write, to be writing) compared with the perfective napsat (to write down, to finish writing). The most common prefixes are na-, o-, po-, s-, u-, vy-, z- and za-. In suffix pairs, a different infinitive ending is added to the perfective stem; for example, the perfective verbs koupit (to buy) and prodat (to sell) have the imperfective forms kupovat and prodávat. Imperfective verbs may undergo further morphology to make other imperfective verbs (iterative and frequentative forms), denoting repeated or regular action. The verb jít (to go) has the iterative form chodit (to go repeatedly) and the frequentative form chodívat (to go regularly).
Is there an answer to this question: What kind of action can morphed prefixes be a sign of?

Answer: unanswerable


Question: Today, thanks to Paris' cosmopolitan population, every French regional cuisine and almost every national cuisine in the world can be found there; the city has more than 9,000 restaurants. The Michelin Guide has been a standard guide to French restaurants since 1900, awarding its highest award, three stars, to the best restaurants in France. In 2015, of the 29 Michelin three-star restaurants in France, nine are located in Paris. These include both restaurants which serve classical French cuisine, such as L'Ambroisie in the Place des Vosges, and those which serve non-traditional menus, such as L'Astrance, which combines French and Asian cuisines. Several of France's most famous chefs, including Pierre Gagnaire, Alain Ducasse, Yannick Alléno and Alain Passard, have three-star restaurants in Paris.
Is there an answer to this question: How many 3 star Michelin restaurants were in Paris in 2015?

Answer: nine


Question: The first successful light bulb filaments were made of carbon (from carbonized paper or bamboo). Early carbon filaments had a negative temperature coefficient of resistance — as they got hotter, their electrical resistance decreased. This made the lamp sensitive to fluctuations in the power supply, since a small increase of voltage would cause the filament to heat up, reducing its resistance and causing it to draw even more power and heat even further. In the "flashing" process, carbon filaments were heated by current passing through them while in an evacuated vessel containing hydrocarbon vapor (usually gasoline). The carbon deposited on the filament by this treatment improved the uniformity and strength of filaments as well as their efficiency. A metallized or "graphitized" filament was first heated in a high-temperature oven before flashing and lamp assembly. This transformed the carbon into graphite which further strengthened and smoothed the filament. This also changed the filament to have a positive temperature coefficient, like a metallic conductor, and helped stabilize the lamp's power consumption, temperature and light output against minor variations in supply voltage.
Is there an answer to this question: What was not a problem for early carbon filaments?

Answer: unanswerable


Question: The Wagner tuba, a modified member of the horn family, appears in Richard Wagner's cycle Der Ring des Nibelungen and several other works by Strauss, Béla Bartók, and others; it has a prominent role in Anton Bruckner's Symphony No. 7 in E Major. Cornets appear in Pyotr Ilyich Tchaikovsky's ballet Swan Lake, Claude Debussy's La Mer, and several orchestral works by Hector Berlioz. Unless these instruments are played by members doubling on another instrument (for example, a trombone player changing to euphonium for a certain passage), orchestras will use freelance musicians to augment their regular rosters.
Is there an answer to this question: Which symphony of Anton Bruckner's does the Wagner tuba have a prominent role in?

Answer:
Symphony No. 7 in E Major