Hello there! As an expert in linguistics and language usage, I'm here to help you with your question about capitalization in English.
When it comes to the phrase "Happy Birthday," there are a few different contexts in which it might appear, and the rules for capitalization can vary depending on those contexts. Let's explore some of them:


1. At the Beginning of a Sentence: In English, the first word of a sentence is always capitalized, regardless of what it is. So, if you're starting a sentence with "Happy Birthday," both "Happy" and "Birthday" should be capitalized.


2. In Titles: Titles and headings often follow different capitalization rules. In title case, most style guides recommend capitalizing the first and last word of the title, and all other major words (nouns, pronouns, verbs, adjectives, adverbs, and some conjunctions). So, in a title, "Happy Birthday" would typically have both words capitalized.


3. On a Cake or a Greeting Card: When writing on a cake or a greeting card, the phrase "Happy Birthday" is almost universally capitalized. This is a form of emphasis and is a common convention in English.


4. In a Poem or Song: Poems and songs often have their own rules for capitalization that can differ from standard prose. If "Happy Birthday" appears in a poem or song, it might be capitalized for stylistic reasons, even if it's not at the beginning of a line.


5. As a Proper Noun: If "Happy Birthday" is being used as a proper noun, such as the title of a book, movie, or song, it would be capitalized.


6. In Normal Text: In the body of a text where "Happy Birthday" is not at the beginning of a sentence, not a title, and not being used as a proper noun, the standard would be to capitalize only the first letter of the first word, "Happy," and leave "birthday" in lowercase.

It's important to note that while these are general guidelines, there can be exceptions based on personal preference, regional differences, or specific style guides. However, the reference you provided from Oct 19, 2012, seems to align with the first point I mentioned, emphasizing the capitalization of the first word of a sentence and proper nouns.

Now, let's move on to the translation into Chinese.

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In a sentence, "happy" and "birthday" are capitalized according to the normal rules of capitalization: Capitalize the first word of the sentence and any proper nouns.Oct 19, 2012read more >>