The dictionary form of a verb, followed by the particle combination made ni ("before/by/until the time when"), indicates another temporal limit for an action. The tense of a sentence using made ni is determined by the final verb.
Hikōki ga Shikago ni tsuku made ni shōsetsu o yonde shimatta.
By the time the plane arrived in Chicago, I had read a novel.
Kachō ga ryokō kara modoru made ni kono shorui o shirabete okimasu.
I'll check these papers (in advance) before the section chief returns from his trip.
Hope this helps!
°˖ ✧◝(○ ヮ ○)◜✧˖ °こゆうきあいはら°˖ ✧◝(○ ヮ ○)◜✧˖ °