In this task, we ask you to write an answer to a question about when an event happened. For example, "going to school" usually happens during the day (not at 2 A.M). Note that a lot of the questions could have more than one correct answer. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.

[EX Q]: Sentence: At current rates of use, coal will last about 300 years. 
Question: How long has been coal used for industrial needs?
[EX A]: literally, for hundreds of years.

[EX Q]: Sentence: By 1930 raw-material production had tripled the figure of 1900, manufactured goods had increased twelve-fold, and heavy industry was galloping towards maturity. 
Question: At what time of the day was manufacturing occurring?
[EX A]: 1:00 PM.

[EX Q]: Sentence: This means it is not moving yet, but it has the potential to move. 
Question: When does it have potential energy?
[EX A]:
constantly.

