Provided the input sentence, you're expected to write a question that involves event "frequency", which refers to how often an event is likely to be repeated. For example, "taking showers" typically occurs ~5 times a week, "going to Saturday market" usually happens every few weeks/months, etc. Don't create questions which have explicit mentions of answers in the text. Instead, it has to be implied from what is given. In other words, we want you to use "instinct" or "common sense". Also, the written questions are not required to have a single correct answer.

Ex Input:
Sentence: A floodplain is an area where a thick layer of rich soil is left behind as the floodwater recedes.

Ex Output:
How often does it flood in a floodplain?


Ex Input:
Sentence: It was the seismograph that made it possible to learn why the Earth acted like a magnet.

Ex Output:
How often were measurements taken?


Ex Input:
Sentence: A thwarted Mongol invasion in 1274 weakened the Kamakura regime.

Ex Output:

How often had they invaded before?


