Double quotation marks are conventionally used to indicate speech, and commas are conventionally used inside the quotation marks to separate a line of speech from its subsequent dialogue tag. Because “‘Can you?’” is a separate sentence from “‘I can’t believe he ate the entire cake,’ she said,’” there must be a period after “she said” to separate the two sentences.

Double quotation marks are conventionally used to indicate speech, and question marks are conventionally used inside the quotation marks to indicate the end of an interrogative sentence. Double quotation marks (without commas) are also conventionally used to indicate skepticism about a word or term, as with “fact sheet” here. However, because “fact sheet” is already within a set of double quotation marks, single quotation marks must be used.

This question is asking whether or not a phrase was said, and that phrase itself is not a question. If a question ends with a quoted statement that is not a question, the question mark will go outside the closing quotation mark.

The error in this sentence comes from the fact that the underlined phrase is a question and therefore should end with a question mark, even when it is inside double quotation marks; therefore, the correct answer is "What if the lost puppy really does below to Jane?"

The error in this sentence is the incorrect punctuation used to separate Elena's first sentence from her second sentence. Since both sentences are complete thoughts, we should change the comma after "said" to a period ("said. 'In fact, I think it was totally an accident.'")

“I was too tired to go out” is an indirect quotation; we know this because it’s preceded by the word “that.” Since indirect quotations don’t require quotation marks, and since a comma is needed before the conjunction (“but”) to separate these two independent clauses, the correct answer is “I told my friends that I was too tired to go out, but really I just wanted to catch up on my favorite TV series.”

This sentence contains a misuse of quotation marks. The words "Brave New World" is an example of the title of a book (written by Aldous Huxley in 1932), which should either be italicized or underlined. The correct answer is, "He bought a new book, Brave New World, to read in his free time."

This sentence contains a misuse of quotation marks. When a quote is inside of another quotation, single quotation marks must be used for the inner quotation. All other rules for capitalization and punctuation are also followed for quotes within quotes. The correct answer is: ""She said, 'We will make the decision by Monday.'"

This sentence contains a quotation error. Stories, poems, and excerpts (along with other forms of media) should have quotes around them. Unlike books, they are not underlined/italicized. The correct answer is, "The poem "The Road Not Taken" is one of Robert Frost's most famous poems."

The "Road Not Taken" was first published in 1916.

This sentence misuses single quotation marks. Single quotation marks can only be used within an existing quotation. Double quotes should be used instead, since it is indicating here that the word "friend" is being used in some special  or ironic way. The best choice is, " "friend" gave."