such and such a

[loanthao]

hello teacher, i want to ask you that how to define about "such" and "such a". whether we use such or such a.Would you mind explaning them to me? look forward to your rely as soon as you can.
thank you very much

[Avalon]

such is used with plurals and uncountable nouns...example:such nice weather/such good students

such a/an is used with singular countable nouns...ex:such a big party.
Got it?