So and such both express emphasis or intensity in English, but they attach to different parts of a sentence — and swapping them produces an error that native speakers notice immediately.
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Write either so or such to complete each of the following sentences.
EXAMPLE: He was so kind to us.
Grammar reviewSo or such?
Both so and such are used to add emphasis, but they work differently depending on what comes next.
SO + adjective or adverb:
Use so when it is followed directly by an adjective or adverb (no noun). The film was so boring. (adjective) He drives so recklessly. (adverb) Why are you so quiet today?
SUCH + (a/an) + adjective + noun:
Use such when a noun follows (with or without an adjective). It was such a boring film. (a + adjective + noun) They are such generous hosts. (adjective + plural noun) He plays with such energy! (noun only, no adjective needed)
SUCH + uncountable noun (no article): Such loyalty is hard to find. I can’t believe she would make such promises.
The quick test:
Ask yourself: is a noun coming? If yes → such. If no (just adjective/adverb) → so.
KEEP PRACTICING — MORE EXERCISES FOR YOU: So and such are intensifiers with different grammatical rules — these exercises cover the broader family of English quantifiers.