1.He trusts her.
Why does he trust her? Who trusts her? In what situations does he trust her?
2.She has measured it
What has she measured? Where has she measure it? When has she measure it?Why has she measure it?
3.They shot at it.
Where did they shoot? Why did they shoot at it? What did they shoot at?
4.He retired.
What job did he retire? Why did he retire ? What did he retire for?