1) What have he seen?

2)Why have you been eaten? (можно оставить так но перевод "Почему ты съеден")

3)What phone have you had?

4)When have she started?

5)What have he broken?

6)What have they decided?

7)When have James arrived?

1.  What has he seen?  

2. Why have you eaten?

3.  Why have you phoned?// Whom have you phoned?

4. When has she started?

5. What has he broken?

6. What have they decided?

7. When has James arrived?

P.S насколько мне изветсно, то с when надо ставить вопросы в past simple

7. When did James arrive?

4. When did he start?