I AM HAVING DIFFICULTY TO UNDERSTAND THIS PHRASE: HE IS WEARING BLU SHIRT.
***** NOT A TEACHER *****
(1) He is wearing a blue shirt (now).
(2) He was wearing a blue shirt (yesterday).
(3) He will be wearing a blue shirt (tomorrow).
***
Tom: Look at all those people.
Sue: Where is Joe?
Tom: There he is!
Sue: Where?
Tom: There by the tree. He is wearing a blue shirt.
Sue: Oh, now I see him!
P.S. Sometimes a native speaker might say "He is wearing a blue
shirt tomorrow," but I respectfully suggest that you NOT do this until
you learn more English.
What difficulty? This is a standard use of the present progressive for something that is happenong/occurring/being at the moment of speaking. TheParser has illustrated this well. If you are still not clear, come back here - but please try to be specific about what the problem is.
Please, do not use all caps.