A. What's the most encouraging book you've ever read?

B. When I took care of my kids, I sometimes had a lot of hard time. ✔

​

Parenting books gave me help every time. -- Parenting books were helpful in those times. => Your sentence has a correct grammatical structure, but this has the correct usage/ expression.

​

The oil price was to be bottom. -- > The oil price has hit bottom. 

kind to me. -- > Would you do me a favor? 

I tried to get her.  -- > I tried to catch her eye. 

=> Corrected : The sentences are corrected grammatically.