Dear (name of friend):
I am having a birthday party this saturday and would like to invite you to come along. I am turning eighteen, which is a big turning point in my life and would want all my friends and family to be there to share this special moment. It would be a casual barbecue at a park near my house and I will send you the exact address closer to the date. Please contact me
as soon as possible to inform me of your attendance.
RSVP: before friday
Contact details: 00000000000
翻译：
亲爱的xx：
这周六我有一个生日聚会，我想邀请你来参加。我将要18岁啦，这是我人生中一个重大的转折点，所以我想邀请所有我的朋友们和家人和我一起分享度过这个特别的时刻。到时会在我家旁边的公园弄一个平常一点的野外烧烤，接近生日那天我会发确切地址给你。请尽快联系我以便告知我你来或不来。