As vs Like — Role vs Resemblance

Use 'as' when something genuinely fills a role or function. Use 'like' for comparison — when something resembles but is not actually what follows.

As vs Like — Role vs Resemblance

The as/like distinction is one of the most reliably tested points at B2 level and one of the most persistently confused. It maps onto a fundamental semantic contrast: identity/function versus similarity. Research published in the journal English Language Teaching found that learners at B1–B2 substitute 'like' for 'as' in role contexts in over 45% of production tasks where the distinction is relevant, even after explicit instruction. The confusion is reinforced by languages — including Russian — in which a single word or construction covers both meanings.

As — In the Role Of

Use 'as' when the person or thing actually IS what follows, or genuinely performs that function:

She works as a nurse at the hospital. (she IS a nurse)
He used the chair as a table. (the chair served that function)
As a child, I spent summers at my grandparents'. (when I was a child)

Like — Similarity and Comparison

Use 'like' when drawing a comparison — the person or thing resembles but is not actually what follows:

He runs like a professional athlete — but he's a dentist. (similar, not identical)
Stop behaving like a child! You're 30. (comparison to a child)
She sings like a professional.

The Function Test

Substitute 'in the role of' for 'as' — if it sounds natural, 'as' is correct. Substitute 'similarly to' for 'like' — if it sounds natural, 'like' is correct.

Common Mistakes

✗ She works like a nurse at the hospital. → ✓ She works as a nurse.
✗ She's been working like a freelance designer for three years. → ✓ She's been working as a freelance designer.
✗ He used the chair like a table. → ✓ He used the chair as a table.