question: this was as a result of dirac being given proofs of a paper by heisenberg to read in the summer of 1925.
Capitalize this past sentence correctly.
A: This was as a result of Dirac being given proofs of a paper by Heisenberg to read in the summer of 1925.

question: sorry but the page you were looking for could not be found.
Capitalize this past sentence correctly.
A: Sorry but the page you were looking for could not be found.

question: in the case that your xlnk file doesn't open, it is highly likely that you do not have the correct software application installed on your pc to view or edit xlnk file extensions.
Capitalize this past sentence correctly.
A: In the case that your XLNK file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit XLNK file extensions.