the jets shook the foundations and rattled the window frames forcing the occupants to step outside to see if a plane was in distress.

How would the previous sentence be correctly capitalized?
Answer: The jets shook the foundations and rattled the window frames forcing the occupants to step outside to see if a plane was in distress.
before you can open a fml file, you'll need to figure out what kind of file the fml file extension refers to.

How would the previous sentence be correctly capitalized?
Answer: Before you can open a FML file, you'll need to figure out what kind of file the FML file extension refers to.
place your vehicles in the best spots to help defend. don't let any enemies through on the 36 waves.

How would the previous sentence be correctly capitalized?
Answer: Place your vehicles in the best spots to help defend. Don't let any enemies through on the 36 waves.
and when it has done this second half of its preliminary work, europe will leap from its seat and exultantly exclaim: well grubbed, old mole!

How would the previous sentence be correctly capitalized?
Answer: And when it has done this second half of its preliminary work, Europe will leap from its seat and exultantly exclaim: well grubbed, old mole!