English — Grammar: Time Clauses (when, while, before, after, until) — 2nd Year Middle School — Algerian Curriculum

Time Clauses (when, while, before, after, until)

Time clauses are used to show the relationship between two events in time. They help us say when something happens in relation to another action.

Common Time Conjunctions

When : at that moment
While : during that time
Before : earlier than
After : later than
Until : up to the time when
As soon as : immediately after

Rules

Rule 1: In future time clauses, use present simple, not will.
✅ Correct: “I will call you when I arrive.”
❌ Incorrect: “I will call you when I will arrive.”

Rule 2: The time clause can come at the beginning or end of the sentence. When it comes first, add a comma.

Examples :
– I always brush my teeth before I go to bed.
– She studied after she finished dinner.
– While I was walking, I met my friend.
– Wait here until I come back.
– Call me as soon as you get home.

Difference between when and while

When : can be used with short and long actions.
While : used with longer actions/continuous tenses.

“When the teacher arrived, the students stood up.” (short action)
“While I was sleeping, someone knocked at the door.” (long action)

Exercises

1. Complete with when, while, before, after, until: “I will wait ___ you finish.” / “She always checks her bag ___ she leaves home.”
2. Correct the mistakes: “I will call you when I will get home.”
3. Write 3 sentences about your daily routine using time clauses.
4. Combine the sentences: “I finished my homework. Then I watched TV.” → “After I finished…”

See also First Conditional and Present Simple Tense.