Such lets us know that the words (items or ideas) following such are similar to, or exempts of what came before the word such. The dog barks at things such as mailmen, doorbells on the TV, sirens, and people walking by outside. Here is a second use of "Such" I am tired of such rude people. In this second version, such is an example of what I am tired of (so it fits my first definition) Yet it also works as a stressing word like "very" would be. The people are very rude = They are such rude people.

thanks both of you

Yes,Sunshin!The answer of teacher Jesse is perfect! Besides,i think you should remember the other notes here: -"so +adjective/adverb +that"= "such +adjective/adverb +noun +that"="so+adjective + a/an+Noun +that " to describe something is so great or extreme. Example: The weather is so hot that/It's such hot weather that most of icebergs in Artic are melting. -"as such as" means like "in itself" Example:The Earth has two main movements as such as going around the Sun and rotating around its axis. -"such as" means "for example=so like" . Example: Kumiko has many talents such as playing piano,drawing,studying science,... Hope they help^-^