This document discusses time clauses, which are subordinate clauses that indicate when something happens in relation to the main clause. Time clauses contain a subject and verb and use conjunctions like "when", "after", or "before" to connect to the main clause. The verb in the time clause is usually in the present simple tense, while the verb in the main clause is typically in the future tense. Time clauses placed before the main clause are followed by commas.

1. TIME CLAUSES

2. FACTS TO REMEMBER
• Time clauses are subordinate clauses.
When you arrive, I will finish my homework.
time clause main clause
• They have at least a subject and a verb.
When you arrive, I will ask you a question.
Conjunction subject verb
• The verb of the time clause is usually a verb in the present
simple. The verb in the main clause is usually in the future.
When you arrive, we will have lunch. (future)
When Mary arrived home, her husband started to cry. (past)
• When they are written before the main clause, they are followed
by commas.
By the time I finish, It will be one o’clock.

3. CONJUNCTIONS AND EXPRESSIONS
INTRODUCING A TIME CLAUSE
• When - When it stops raining, I’ll take the dog out.
• The moment - The moment I saw her, I fell in love.
• As soon as - As soon as you arrive, I will tell you the news.
• Before - I will arrive home before you finish your homework.
• After - I will leave for school after you finish your homework.
• By the time - By the time we arrive, it will be dark.
• Once - Once you have finished, please walk out that door.
• Till - I will stay till you arrive.
• Until - I will stay until you arrive.