During and While

Learn the structural rule: 'during' is followed by a noun or noun phrase, 'while' is followed by a clause (subject + verb).

During and While — Nouns vs Clauses

During and while both express simultaneity — one event occurring within the timeframe of another — but they require different grammatical structures. This is a structural constraint, not a matter of nuance or register. English Profile corpus analysis shows that during/while errors appear in roughly one in five B1-level writing samples where simultaneity is expressed, making this a highly productive area to practise.

During + Noun Phrase

During is a preposition and must be followed by a noun or noun phrase — typically a named event, period, or activity:

I fell asleep during the film.
Please don't use your phone during the lesson.
It started raining during the match.

While + Clause

While is a conjunction and must be followed by a subject and a verb:

She read a book while he was driving.
The phone rang while I was cooking.
While I was on holiday, I visited three museums.

Converting Between the Two

The same meaning can often be expressed with either word by changing the structure:

I fell asleep during the lecture. (noun)
I fell asleep while I was attending the lecture. (clause)

While she was on holiday, someone broke into her flat. (clause)
During her holiday, someone broke into her flat. (noun)

Common Mistakes

✗ During she was on holiday, someone broke in. → ✓ While she was on holiday, someone broke in.
✗ I fell asleep while the lecture. → ✓ I fell asleep during the lecture.