Помгите тамя просто не понимаю прошу прошу помогите

Эхххх... 1. Did he ski? 2. Did they skate? 3. Did they work? 4. Did he jump? 5. Did she skip? 6. Did it stop? 7. Did she helped them

1)Did he sky? 2)Did they skate?3)Did they work? 4)Did he jump? 5)Did she skip? 6)Did he stop 7)не знаю