We can use such (as a determiner) before a noun phrase to add emphasis:
We visited such fascinating places on our trip through central Asia.
She has such lovely hair.
She lived in such loneliness. (formal)
We use such before the indefinite article, a/an:
We had such an awful meal at that restaurant!
Not: We had a such awful meal …
In more formal situations, we can use such to mean ‘of this or that kind’. We can use it before a/an or after expressions like the only, the first, the second:
You must not destroy people’s houses. I could never agree to such a plan. (a plan of that kind)
A college is offering a degree in pop music composition. It is the only such course in the country. (the only course of that kind)
We can use a that-clause after a noun phrase with such:
He is such a bad-tempered person that no one can work with him for long.
It was such a long and difficult exam that I was completely exhausted at the end.
