Note: Americans often type two blanks after the punctuation mark at the end of a sentence.
Full Stop (Period)
Use a full stop (also called »period«) to end affirmative sentences.
Example: I go shopping every day.
Use a full stop to end orders.
Example: Leave me alone.
Use an exclamation mark at the end of a surprised exclamation (usually starting with »how« or »what«).
Example: How awful! What a chaos!
Use an exclamation mark at the end of a wish.
Example: Good luck!
Use a questions mark at the end of a question.
Example: What's your name?
Use a questions mark after question tags.
Example: You are Connor, aren't you?
Use a questions mark at the end of a request.
Example: Could you give me the book, please?