I go to Japan stayed there 4 days then go back to United state ( USA)

stayed or staying?
what is the different meaning between them?

Thanks Paul

I will go to japan,will stay there for 4 days and come back to America.

Your punctuation needs correcting, and Japan requires a capital letter. There is no need for the second "will", and I would insert "then". Also "return" is better than "come back to":

"I will go to Japan, stay there for four days, and then return to the United States".



PaulM