ACT® · English: Usage Conventions
Expressions That Deviate from Idiomatic English
Idiomatic expressions are word pairings that edited writing accepts by convention, like "different from" rather than "different than." The exam's enhanced English test no longer tests these at all.
Idiomatic expressions are the fixed word pairings that careful, edited writing settles on, even when no grammar rule forces the choice. Speech is looser. People say "different than," "bored of," "could care less" constantly, and nobody blinks. But edited prose pairs "different" with "from," and that gap between what gets said and what gets printed is exactly what an idiom question used to probe.
The check was never about what sounds natural. It was about whether edited writing ever actually pairs those exact words. That test favored whoever had read the most edited English, which meant it rewarded exposure rather than a rule a student could learn and apply. A student fluent in spoken English but newer to its written conventions could lose points for phrasing that sounds completely normal out loud.
That is precisely why idiom items sit at the edge of this unit rather than inside it. The enhanced English test, which now runs on a tighter clock, dropped idiomatic-usage questions altogether, because they measured familiarity with English rather than a testable rule, putting students still learning the language at an unfair disadvantage. The rest of usage conventions, agreement, verb forms, pronoun choice, word choice, survived because each rests on a rule you can state and check. Idiom rested on memory of usage alone, so it was cut.
Key terms
- Idiomatic expression
- A word pairing that edited writing accepts by convention, not because a grammar rule requires it.
- Edited writing
- Prose that has gone through revision toward a standard, as opposed to casual speech.
- Could not care less
- The idiom that correctly reports zero interest, because the negative is present in the phrase.
- Enhanced English test
- The revised version of the test that dropped idiomatic-usage questions.
Watch it explained
- How it worksHow do you spot a non-idiomatic expression by checking whether careful writing ever pairs those words?
- Common mistakeWhy isn't 'could care less' the same as 'couldn't care less' when both are said constantly?
- Going furtherWhat happened to idiom items on the enhanced ACT, and why did ACT retire them from the English test?
Check yourself
End of topic.