Give the reason why these parentheses are or are not used correctly: The tour guide said, "The Great Wall of China is over 13,000 miles long [though some sections are no longer intact]."
No, this is an example of additional information inside a quote. This should then be in brackets and not parentheses.
Brackets are used to add information or clarify meaning inside this type of quoted text.
What is a direct quotation?
Braces are rarely used in formal writing but can show this kind of grouping.
What is a list or set?
Parentheses are used to add this type of information that isn’t essential to the main sentence.
What is extra or nonessential information?
Brackets are used to adjust this in a quote to fit the grammar of your sentence.
What are verb tense or pronouns?
What is to define a block of code?
If the information inside the parentheses is a complete sentence, this is where the period should go.
What is inside the parentheses?
What kind of information is used when to include background to something mentioned in the text.
What is previous information/context.
Parentheses should not be used when this other punctuation is better for setting off information.
What are commas or dashes?