Purpose:

Examples:

  • We had a meeting today so as to discuss next year's programme.
  • He did all he could for her not to worry.
  • I moved to France so that I could improve my French.
  • Everyone did their best in order to finish the work. 

 

Reason:

Examples:

  • Since you don't believe me, I won't give evidence.
  • Because of his lack of training he had difficulties finding a job.
  • He gave him his jacket out of pity.
  • On account of the weather we didn't go for a walk.
  • Billy was punished for lying to his teacher.
  • Owing to the snow,the planes couldn't take off.
  • As you are a foreigner you can't express your opinions on the situation in the area.
  • Seeing that you aren't interested I' ll do it by myself.

 

Result:

 

Examples:

  • He missed the early train, as a result he was too late for the job interview.
  • The result of his trial, therefore, could hardly have been other than a foregone conclusion.
  • If he locked the door, then Kitty is trapped inside.

commented

Simple BECAUSE is omitted. It is used the same way as AS/SINCE, but it cannot be used at the beginning of the sentence unless it is direct answering the question WHY?. "Why didn't you come yesterday? - Because I was busy."
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