日が短くなってきた。

day; days; sun; sunshine; sunlight; case (esp. unfortunate); event

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

short

to become; to get; to grow; to be; to reach; to attain; to result in; to prove to be; to consist of; to be composed of; to succeed; to be complete; to change into; to be exchanged for; to play a role; to be promoted; to do ...