question: for a sports–oriented person like deb, who doesn’t hold back on any of her activities, i think this will be a new life for her and us.”
Capitalize this past sentence correctly.
A: For a sports–oriented person like Deb, who doesn’t hold back on any of her activities, I think this will be a new life for her and us.”

question: heat is produced by current flow through a contact with high electrical resistance.
Capitalize this past sentence correctly.
A: Heat is produced by current flow through a contact with high electrical resistance.

question: if the software is not able to recover a raw photo, chances are that the image is recovered as a tif file.
Capitalize this past sentence correctly.
A: If the software is not able to recover a RAW photo, chances are that the image is recovered as a TIF file.