During, While & For
Level B1 · Prepositions
during, while, and for all relate to time, but they answer different questions and take different kinds of words after them. during and while both mean 'at some point within a period' or 'at the same time as', but during is followed by a noun and while is followed by a clause (subject + verb); for is different again — it answers 'how long', not 'when', and is followed by a length of time.
Choose the right word for what follows it:
- during + noun/noun phrase — something happens at some point within that period: during the meeting, during the flight, during the summer.
- while + subject + verb (a clause) — something happens at the same time as another action: while I was cooking, while she waits, while it rains.
- for + a length of time — how long something lasts, not when it happens: for two hours, for a week, for three years.
- while can also mean 'whereas', contrasting two facts rather than describing simultaneous time: while I like coffee, my sister prefers tea.
The most common mistake is following during with a length of time instead of an event — during three hours is wrong; for a duration, use for: for three hours. A second mistake is following while with a noun instead of a clause — while the film is wrong; either add a subject and verb (while I watched the film) or switch to during (during the film).
Ask two questions: how long, or when? For a duration in hours/days/years, use for (for two hours). For a single point within a period, check what follows — a noun takes during (during the storm), a full clause with its own subject and verb takes while (while the storm was raging).