一個人，

sibling (n.) a brother or sister

etiquette (n.) the set of rules or customs that control accepted behavior in particular social groups and social situations

 behavior=manner

etiquette=manners

ex:MRT etiquette, classroom etiquette

verbal communication ex:letter, email, speech, meeting, texting message(voice message)

unverbal communication ex:gesture, eye contact, body language, facial expression

Business letter example:

Dear M. Eaton,

Thank you for your e-mail and the application form for the position.

I've completed the application form. Please refer to the attachment below. I have two questions about the job. First, could you inform me which part of the world this tour guide job covers? Besides, I would like to know when I should star working? Finally, I would really appreciate it if you could provide me with more background information of your company.

I look forward to hearing from you again.

Sincerely yours,

J Moore