Time clauses (when/while)

A2 Elementary

Time clauses with when and while connect two events to show their relationship in time. They indicate whether actions happen at the same time or one after another.

Overview

Time clauses tell us when something happens. When is typically used for short actions or events that happen one after another. While is used for continuous actions that happen at the same time as another event.

Sentence Structure

When/While + subject + verb, subject + verb

The time clause can come at the beginning or the end of the sentence. If the time clause starts the sentence, use a comma after it.

When vs. While

Use when with the past simple for sudden events. Use while with the past continuous for background actions.

Conjunction	Usage	Example
When	Single actions or short events	When the phone rang, I answered it.
While	Longer actions in progress	While I was cooking, the phone rang.

Examples

Common mistakes

When I will see him, I will tell him.
When I see him, I will tell him.
Do not use 'will' inside the time clause, even when talking about the future.
While I finished my homework I went out.
When I finished my homework I went out.
Use 'when' for completed actions that happen in a sequence.

Practice

I was sleeping ___ the doorbell rang.
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when
Answer:when
Why:Use 'when' before a short, sudden action that interrupts a longer one.
___ they were watching the movie, they ate popcorn.
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While
Answer:While
Why:Use 'while' for a continuous action that happens at the same time as another activity.
___ I get home tonight, I am going to have dinner.
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When
Answer:When
Why:Use 'when' for a specific point in time or a completed sequence, and remember to use the present tense for future meaning.