Best Platform to learn English
"Adverbs of Purpose or Reasons express the reason, an aim or target behind the happening of a particular action." These words help to describe why something happened.
Adverbs of purpose are used to connect sentences that wouldn’t make sense if they were formed alone.
Adverbs of purpose may be in the form of an individual word or in the form of clauses (group of words). (The test question is why?).
» The test question 'Why?' : He was left because he was late.
Note : 'So that' is a common Adverb of Purpose. We can drop that in 'so that' if we find it too long. However, use of only 'so' is often regarded as informal.