Now let’s come to part 3 ? invitation cards
The teacher first supply some information about how to make an invitation card. Let’s study these tips one by one.

And then let’s come to a sample of invitation card
   sample I is a rather formal card for a birthday party, which can be felt by the words used.
   request the pleasure of your company: ask your coming
   in celebration of: to celebrate
   by contrast, sample 2 is an informal one, as its words used are quite common.
   Please try to translate the following invitation card into English.
   学生会主席特邀请约翰 史密斯夫妇参加于12月30日星期四晚七点在大学音乐厅举办的新年晚会。
   (RSVP) comes from French expression, (Répondez s'il vous plait.（法语）means Reply, if you please