I bought some bread when I went to the store. What comes before the apostrophe determines whether the subject is singular or plural. Having walked as far as I could. I camped for the night, having walked as far as I could. There were red cars with convertible tops all around us.
Most punctuation goes inside quotation marks.
Use only one punctuation mark to end a sentence. Capitalize the first letter of dialogue. It's peanut butter. Whenever Eugene gets ready to walk, the dogs get excited. Some short introducory elements may not need commas.