Emphasizers: "so" and "such"

The words so and such are used to add emphasis to adjectives, adverbs, and nouns, meaning "very" or "extremely". They can also introduce result clauses containing that (e.g., It was so cold that the river froze). The choice between so and such is determined purely by the parts of speech that follow them.

Use so directly before an adjective or an adverb (e.g., so beautiful, so quickly). Use such before a noun phrase, which may include an adjective and a noun. If the noun is singular and countable, you must include the article a or an after such, yielding the pattern such + a/an + adjective + noun (e.g., such a beautiful day). For plural or uncountable nouns, omit the article (e.g., such nice people, such warm weather).

A common learner mistake is using so instead of such before an adjective followed by a noun (e.g., saying It was so a cold day instead of It was such a cold day). Another frequent error is forgetting the article a/an after such when modifying a singular countable noun (e.g., writing He is such nice boy instead of He is such a nice boy).