question: unsure about which type of xys file you have? do you want to know exactly what it is, who created it, and how to open it?
Capitalize this past sentence correctly.
A: Unsure about which type of XYS file you have? Do you want to know exactly what it is, who created it, and how to open it?

question: this method of giving the "hitler" label to any individual threatened with "destruction" later was generally adopted (president nasser of egypt being a case in point).
Capitalize this past sentence correctly.
A: This method of giving the "Hitler" label to any individual threatened with "destruction" later was generally adopted (President Nasser of Egypt being a case in point).

question: free textbooks: how is this possible?
Capitalize this past sentence correctly.
A: Free Textbooks: how is this possible?