Sometime, sometimes and some time(s) Anyone, everyone-- and any one, every one.
Let's go skiing sometime. Sometimes I go skiiing alone. I spent some time learning to ski last winter. There are some times that I prefer to sit in the cafe and watch the other skiers.
"Everyone" refers to everybody as a whole as in "Everyone enjoyed the concert". "Every one" refers to individuals as in "I liked every one of those dancers".
"Anyone" refers to a person as in "Anyone can dance like that". "Any one" means any indiviual item as in "Pick any one item and it is yours for half price".