The apostrophe in English is a very valuable sign. I want to know about the way it is used to omit letters of a word. I often see authors omitting letters in dialogues (in books, articles, blogs, scripts):
- They had to take 'em away. ('em=them)
- I was down 'n' broken last night. ('n'=and)
- We were ridin' to town yesterday. (ridin'=riding)
Why is it done so and how bad is it in dialogues (especially in books)?