Assuming the sentence refers to something you ask yourself, it would typically end with a period.
No, not every sentence with "if" has to end with a question mark. The use of a question mark at the end of a sentence depends on whether the sentence is asking a question or stating a fact.
Question mark (?) is put at the end of a sentence to indicate that it is a question.
An interrogative sentence typically ends with a question mark (?) to indicate that it is asking a question.
No, not always. most of the time, though, but not always
If you are asking the question it ends with a question mark. If you are quoting a question it has to be quoted exactly as it was written but can be contained in a regular sentence that ends in a period.
The question mark is known as a query.
No, an interrogative sentence typically ends with a question mark. This punctuation indicates that the sentence is asking a question rather than making a statement.
You use a question mark (?) as the punctuation after the sentence or question you are asking.
A question mark is a punctuation mark, it replaces the use of a full stop at the end of a sentence that is asking a question.
Interrogative sentences are questions, so the tend to end with a question mark.
No, the correct sentence would be "Who is the singing woman?" by adding a question mark at the end. It is asking for the identity of a woman who is singing.
You don't need the word "at" because asking "Where is the car?" is a sufficient question. Also, in English, the sentence should not end with a preposition, and "at" is a preposition.