you'll probably get my attention (with a hint of abhorrence) if you...

• cannot tell the difference, and therefore improperly use the following: their, there, and they're; will and we'll; your and you're...
• don't know your pronouns
• confuse me with your misuse of tenses
• hurt my ears by not knowing when to use the singular or plural form

bad grammar. common but still annoying.

one more thing, p & f are two very different letters... please, practice. enunciate.