Saber is more like to express your knowledge or ignorance of a fact and concer is to be aquainted or not be aquainted to something.
The sentence is correct:
You would use “tener” if you are hungry, thirsty, sleepy, etc.
And for the other, when you have two verbs together, the second is not conjugated.
Hope this helps!
Aspecto en que forma? Pasa un poco más de contexto
Answer:
A. Tu libro
Explanation:
Lol i know fluent spanish
