[{"Bold_text": "adverb", "List Items": ["at what time or period? how long ago? how soon?:When are they to arrive?When did the Roman Empire exist?", "under what circumstances? upon what occasion?:When is a letter of condolence in order?When did you ever see such a crowd?"]}, {"Bold_text": "conjunction", "List Items": ["at what time:to know when to be silent.", "at the time or in the event that:when we young;when the noise stops.", "at any time; whenever :He is impatient when he is kept waiting.", "upon or after which; and then:We had just fallen asleep when the bell rang.", "while on the contrary; considering that; whereas:Why are you here when you should be in school?"]}, {"Bold_text": "pronoun", "List Items": ["what time:Till when is the store open?", "which time:They left on Monday, since when we have heard nothing."]}, {"Bold_text": "noun", "List Items": ["the time of anything:the when and the where of an act."]}]