Mechanics refers to the rules of the written language, such as capitalization, punctuation and spelling. An understanding of both grammar and mechanics is required to clearly communicate your ideas in a paper.
ill eat you out hmu yuh ;)
1 = I don't think the mail has arrived yet.
2 = Nobody has bought him a present yet. (?)
3 = We have been here for forty minutes already.
Lol I hope this helps- About the second one, I didn't know whether or not it was correct, but I think all the others are!
