Assertion: announcement | /r/HasProperty | informal type
Facets:
value: as major topic
type: MANNER
value: usually
type: TEMPORAL
Source sentences:
text: Such declarations are usually of an informal type so, the letter must be written in an informal way, should be simple and should clearly narrate the reason for the announcement letter.
text: Announcement is one of functional texts in high schools as major topic to learn when students deal with English subject.