I hope you check my answers or mistakes, and also I can't understand the last one.

(x) It's very hard to me
(o) It’s very hard for me.

(x) I'm successed at that
(o) I successed in that.

(x) like books and etc.
(o) I like books and etc…

(x) I lost my weight
(o)I lose my weight.

(x) It starts after two hours
(o) It starts in two hours.

(x) My opinion is the same with you
(o) My opinion is same as you.

He died in a car accident after working hard to get success...
(x) He is so poor!
(o) How poor him!

(x) He is a staff there
(o) He is a staff member there

(x) His saying is right
(o) He says right thing.

(x) Can I have two 5 dollars?
(o)