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'So' + adjective/adverb + 'that'; 'such' + noun phrase + 'that'; both express a degree so extreme it produces a result.
Side-by-side comparison
"So... that" goes with an adjective or adverb to show the degree that produces a result: "It was so hot that we left". The intensifier modifies how something was.
The proposal was so detailed that the client approved it without requesting a single revision.
He spoke so quickly during the presentation that the non-native speakers in the room could barely follow.
The new software is so intuitive that new employees can use it effectively within a single day of training.
"Such... that" goes with a noun or noun phrase to show the nature that produces a result: "It was such a hot day that we left". It modifies what kind of thing something was.
It was such a significant acquisition that it made the front page of three major financial newspapers.
She has such exceptional analytical skills that the team consistently relies on her to interpret complex data sets.
There was such strong market demand for the product that the first production run sold out within forty-eight hours.
Common mistake
- •The most common errors: "It was so a long meeting" is wrong, with a noun use SUCH: "It was SUCH a long meeting." And "She is such intelligent" is wrong, with adjective only (no noun) use SO: "She is SO intelligent." If there is A/AN after the intensifier = SUCH.
- •If an adjective alone follows = SO.
Trick to remember it
Does the word immediately after the intensifier come out as an adjective/adverb or a noun? SO + adjective/adverb: "so intelligent," "so quickly." SUCH + noun (with or without adjective): "such a long meeting," "such talent." If there is A/AN after the intensifier = SUCH (SUCH always goes with singular countable nouns).
Quick rule
"So" + adjective/adverb + that. "Such" + (a/an) + noun (+ adjective) + that. SO = intensity of a quality. SUCH = intensity of the thing as a whole.
Did you know?
"Tal talento que..." = such talent that... This cross-language symmetry is not coincidence: it reflects a fundamental categorical difference (adjective/adverb vs noun phrase) that European languages encode systematically, though with different morphology. Interestingly, in informal spoken English, SUCH + adjective without a noun is gaining ground: "It was such boring" is heard increasingly in colloquial American English among younger generations, though it remains non-standard in formal writing.
Practise what you learned
Exercise 1 · Pick the right one
The film was _____ boring that three people left before the end.
Exercise 2 · Pick the right one
It was _____ a long journey that they had to stop twice for fuel.
Exercise 3 · Form the word
Related word pairs
'Rather' suggests a surprising or negative degree; 'quite' can be moderate or absolute; 'fairly' is moderate and positive.
"So" intensifies adjectives and adverbs alone; "such" intensifies noun phrases (adjective + noun).
'A' is used before consonant sounds; 'an' is used before vowel sounds.
'A lot of' works for countable and uncountable; 'many' only for countable; 'much' only for uncountable.
Bryan López
Founder of SpeakUP Academy