How to find an attribute?

How to find attributes in these sentences,and not to confuse them with other members of the sentence?

1. It was such a cruel thing (what kind of?) to have happened to that gentle, helpless creature.
To have happened to that gentle, helpless creature - an attribute?

2. Dumb with amazement, I slumped into (whose?) my chair.
My - an attribute?

3. The fence (what kind of?) surrounding the garden is newly painted.
Surrounding the garden - an attribute?
Did I miss any attributes,or choose the wrong ones?
Please help me...

And one more thing...Newly is an adverbial modifier in the last sentence?