Formal invitation is a letter, written in formal language, in the stipulated format for official purpose, while informal invitation written to friends, family, acquantance, a letter writen in a friendly manner to someone you are familiar with.
 Learning Activity 3
3.Announcement
Spoken or Oral announcement is an announcement that is announced orally. Usually done at information centers and often found in public places such as airports, hospitals, supermarkets, cinemas, schools, and other public places, where there are crowded crowds of visitors.
Written announcement usually begins with the title or for whom the announcement is written. The announcement should be written simply and clearly.
 Learning Activity 4
4.Advertisement
The social function
Advertising is a form of communication between producers and audiences by utilizing mass media, so that messages can be received globally and simultaneously. advertising also has the ability to change people's behavior. so that often there are misconceptions in the social function of an advertisement.
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