Quotation Marks and Commas in Dialogue

Which sentence is written correctly? Mom said William will be here soon. Mom said, "William will be here soon." Mom said, "william will be here soon." Which sentence is written correctly? "Can you explain?" asked Tod. "can you explain?" asked Tod. Can you explain? asked Tod. Which sentence is written correctly? Watch out! Sam shouted. "Watch out!" Sam shouted. "Watch out! Sam shouted. Which question is written correctly? Rose said, "I am tired, so I am going to go to bed." Rose said "I am tired, so I am going to go to bed." Rose Said, "i am tired, so I am going to go to bed." Which question is written correctly? Dorothy whispered "Please don't wake the baby up." Dorothy whispered, "Please don't wake the baby up." Dorothy whispered "please don't wake the baby up!"