Angry vs. being angry

• 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)