Such as: To give examples: "She doesn't like small animals, such as cats and dogs". Such a/an: To strengthen opinions: "He is such a nice person". "Today is such an amazing day". "My Ferrari is such a red car". (such + a(an)+ adjective + noun) Such: To refer to someone or something already mentioned: "Some children are too excited in class. I don't know how to teach them in such situations".

It's such a good book or It's such an expensive restaurant :)