• He is very angry
  (this sentence has no special connotation other than what it clearly indicates)
• Ravikumar is busy with his dance classes
  (i.e., he is generally busy with his dance classes.)
• Arabian dates are so costly
  (i.e., it is so generally)

Now let us see what difference ‘being’ makes

• Soja is being very angry now!
  (This sentence indicates that the speaker is surprised to see why she is very angry. Because she is generally not angry)
• I don’t know why he is being late today
  (i.e., he is not usually late)
• She is being very generous to the poor
  (i.e., usually she is not generous.)
• I don’t know why Thomaskutty is being very unhappy.
  (i.e., otherwise he is a very happy individual.)
• Arabian dates are being very costly now.
  (i.e., usually it is not costly)