1. When did master lose Chuchu?
2. Master lost Chuchu when they went out for a walk.
3. You must be master of your circumstances.
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#2 is the answer to the question 1. Will you look at the word 'master'? There is no article before 'master.' Can we use that way? In an example sentence as in #3, we can find 'master' without an article. According to the explanation of the dictionary, 'the article' is often omitted in that case. Can we find such an explanation in any English dictionary? Or is that a wrong explanation?
In this case there should be a modified before "master". "When did his master lose Chuchu?" "His master lost Chuchu..." In the third sentence, "master" needs no further modifier.
In English, the use of articles (such as "a," "an," and "the") can be a bit complex, as there are rules and exceptions to consider. Regarding your specific question about the word "master," it is possible to use it without an article, depending on the context.
In example sentence #3, "You must be master of your circumstances," the word "master" is used as a noun without an article. This usage is more common in older or more formal contexts, and it implies a sense of control or authority over something. In this case, "master" is used to convey that one should have complete control or mastery over their own circumstances.
Regarding your question about finding such an explanation in an English dictionary, different dictionaries may have varying explanations and examples. However, you could generally find information about the use of articles and specific examples of when they are omitted in the entry for the word "article" or under the grammar section of a comprehensive English dictionary.
Keep in mind that language is flexible and usage can vary, so it's possible to find different explanations and interpretations. If you're unsure about the usage of articles or other grammar aspects, it can be helpful to refer to reputable English grammar books or consult with a language expert or teacher for further clarification.