• Start & ending of sentences.
• Its vs it’s.
"Its" shows possession, while "it’s" is a contraction for “it is.”
• Your vs you’re.
"Your" shows possession, and "you’re" is a contraction for “you are.”
• Social media language: "wanna" and "kinda" are inappropriate in formal writing.
• A vs an. Use "an" before words starting with a vowel sound; an apple.
• Beginning & ending of an e-mail.
Start with a polite greeting like “Dear Mr./Ms./Mrs.” and end with a closing phrase like “Yours faithfully/sincerely” or “Best regards” for an informal e-mail to a friend.