*Slang in brackets ()
*Extra notes in square brackets []
Let's go to the bar, I'll treat everybody to a beer. (Let's go drink. Beers on me)
We had to fire the nanny since she treated the children badly. [but the sentence is still okay]
He was fired because he was always coming to work late [but the sentence is still okay]
How much did your house cost? [your sentence is okay however]