You got the right answer its knack, knacks definition is having clever skill or a special talent
When the Bruno says, "He can't understand why Shmuel would <u>want</u> to live at Auschwitz." That is how the author makes the reader believe that Bruno doesn't understand what is happening at Auschwitz.
That would be 'present perfect'.
Past perfect would be 'had seen'.
There is no such tense called 'present past.'
Damaris,Diya,Emerson,Graeme,Inez,Kamdyn,Kya,Zander
Well, if you want to get your purpose. You have to be smart.