Work in pairs. Ask questions and answer them. Begin your questions with "Have you ever..?"
1) Win chess games
2) make a cake
3) send e-mail
4) spend your holidays abroad
5) buy a pet
6) Teach any school subject
7) grow vegetables
8) Speak German
9) burn your hand

Have you ever won chess games?Have you ever made a cake?Have you ever sent a mail?Have you ever spent your holidays abroad?Have you ever bought a pet?Have you ever teached any school subject?Have you ever grew vegetables?Have you ever spoke German?Have you ever burn your hand?