I sometimes say "question mark" out loud but then again, I have robo-droid-person autism. For writing, I look at the writings, like diary entries or letters, of the past. For sure, as another person has mentioned, books help, and I'd like to add that directly borrowing/learning from person-to-person texts can give you a good presentation of expression just through text. Also, it might be of help to look at words by themselves, by which I mean that you think of a word and look up a synonym with a connotation suiting the emotion you wanna give your writing. For example, "happy" and "jolly" mean the same but express it differently