The punctuation marks that signal the end of a sentence are he period, the question mark, and the exclamation mark. You use the period , by far the most common of the end punctuation marks, to terminate a sentence that makes a statement. You may also use periods with imperative sentences that have no sense of urgency or excitement attached. When you want to express a sense of urgency or very strong emotion, you may end your imperative sentences ans statements with an exclamation mark .
Exclamation marks are rare in formal writing.
Use them as least as possible, if at all. You should use the question mark at the end of a direct question. Be careful not to use a question mark at the end of an indirect question. Indirect questions are statements and they end with a period.