Article in English: Before you start your email, make sure that you have the correct email address for your friend. If you’ve sent an email to them in the past, you can find their email in your email contacts. Otherwise, you can ask another friend. Type their email address into the box labeled “To.” The subject box is located below the “To” box and labeled “Subject.”  Summarize your email in a few words here so your friend knows what to expect.  If you’re just writing to say hello, your subject line could be as simple as “Hi!” If you’re writing to invite your friend to your birthday party, you could make the subject, “Invitation to my birthday party.” Start your email with a greeting, followed by the person’s name and a comma. Since this is an email to a friend, you can say something casual like “hi,” “hey,” or “hello.” ”Hi Kate,” is an example of a basic greeting. Skip a line, and ask a question like, “How are you doing?” or make a statement like, “I hope you’re doing well.” This shows your friend you care about them.

Summary in Vietnamese:
Tìm địa chỉ email của cậu ấy. Chọn chủ đề tóm tắt nội dung email của bạn. Mở đầu với một lời chào. Hỏi thăm họ.