AS - COMPARATIVE, TIME, REASON.

AS

• COMPARATIVE
• as...as... John is as bad as his brother.
• so...as.... (negative only) John isn't so bad as his brother.
• twice as.... John is twice as bad as his brother.
• as well as... John is bad, as well as his brother.

AS (TIME)

• TIME - SIMULTANEOUS SITUATIONS.
• Cris left as I arrived.
• As they walked along the sidewalk, it started to rain.
• I began to like to class more as I got used to them.
• The thief was caught as he was climbing over the roof.
• We had to leave just as the movie was getting interesting.

AS (REASON)

• As the 4th of July is a holiday, all shops will be closed.
• As she never goes out, she doesn 't know many people.