How to say during his seven years in japan, he studied japanese in earnest. in Japanese
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日本日本(nippon) (n) japanにに(ni) (prt) indicates such things as location of person or thing, location of short-term action, etc.滞在滞在(taizai) (n,vs) stay/sojournしたした(shita) (n) did/a past form of the previous verb/tongue/tongue-like object/clapper/talon７７(７) (num) seven/hepta-年年(nen) (ctr) counter for yearsのの(no) (prt) indicates possessive/nominalizes verbs and adjectives/substitutes for "ga" in subordinate phrases/indicates a confident conclusion/ indicates emotional emphasis/indicates question間に間に(mani) (adv) while/during、、(、) Japanese comma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日本語日本語(nihongo) (n,adj-no) japaneseをを(wo) (prt) indicates direct object of action/indicates subject of causative expression/indicates an area traversed/indicates time over which action takes place/indicates point of departure or separation of action/indicates object of desire, like, hate,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 "."
