How to say he studied hard day after day. in Japanese
1)
彼彼(kare) (ok) that , or something understood without naming it directly)/that person/over there/hey/eh?/thatはは(ha) (int) indicating a subject/yes/indeed/well/ha!/what?/huh?/sigh来る来る(kuru) (v5r,vi) to come/to arrive/to be due to/next/forthcoming/coming日日(nichi) (n-suf) day of month/counter for daysもも(mo) (prt) also/too/words of similar weight/about/as much as/even/more/further/other/again来る来る(kuru) (v5r,vi) to come/to arrive/to be due to/next/forthcoming/coming日日(nichi) (n-suf) day of month/counter for daysもも(mo) (prt) also/too/words of similar weight/about/as much as/even/more/further/other/again熱心熱心(nesshin) (adj-na,n) zeal/enthusiasmにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.勉強勉強(benkyou) (n,vs) study/diligence/discount/reductionしたした(shita) (n) did/a past form of the previous verb/tongue/tongue-like object/clapper/talon。。(。) Japanese period "."
