everything 用于肯定的,anything用于否定句,还有everything是所有的意思而anything是任何的意思. eg. Anything u need, pls advise me that I could provide you everything here. 需要任何东西,请告诉我,我可以提供你这里所有的东西.
首先意思不同,EVERYTHING是每一件事或东西,而ANYTHING是任何东西,其次用法不同,前者用于肯定句,后者用于否定句