Time Clauses

• Time clauses show a relationship between two actions/events.  You cannot use time clauses alone.  They always have a main clause.
• I will call you when I get home.

  
  

  -When I get home = time clause

  -I will call you = main clause
• Some common time clause words are:

  -when

  -after

  -before

  -until

 

• Do your homework before the lesson starts.	I will do my homework after dinner.
  When I get home, I will call you.*	There is a tornado warning until 5:00 o'clock.

• *Remember! You can use time clauses at the beginning of a sentence.  Use a comma (,) after the time clause.

  When I get home, I will call you. =  I will call you when I get home.

Source : Alison