高校のころは走ったものです。

senior high school; high school

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

roller; runner; dried whale blubber

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to run; to travel (movement of vehicles); to drive; to hurry to; to retreat (from battle); to take flight; to run away from home; to elope; to tend heavily toward

person

be; is