彼(かれ) kareは waフ()ラ()ン()ス()語(ご) furansugoを o懸(けん)命(めい)に() kenmeini勉(べん)強(きょう)し()て() benkyoushiteきた kita。 He has been studying French diligently. Literal He [topic-は] French [object-を] diligently studied [over time-てきた]. ~てきた marks an action that has continued up to the present. 懸命に means 'diligently, earnestly.' studyinglanguage learning~てくる (change over time)
彼(かれ) kareは waフ()ラ()ン()ス()語(ご) furansugoを o懸(けん)命(めい)に() kenmeini勉(べん)強(きょう)し()て() benkyoushiteきた kita。 He has been studying French diligently. Literal He [topic-は] French [object-を] diligently studied [over time-てきた]. ~てきた marks an action that has continued up to the present. 懸命に means 'diligently, earnestly.' studyinglanguage learning~てくる (change over time)