彼(かの)女(じょ) kanojoは waがん ganに niかかっている kakatteiruこと kotoを o知(し)っ()た() shittaに niちがいない chigainai。 She must have realized she had cancer. cancerillnessknowledgespeculation~に違いない (must be)~ている (ongoing state)~にかかる (suffer from illness)~ことを + verb (nominalization as object)embedded clause
彼(かの)女(じょ) kanojoは wa胃(い)が()ん() iganで de死(し)ん()だ() shinda。 She died of stomach cancer. deathcancerillnessで (cause/reason)胃がん (stomach cancer)
彼(かの)女(じょ) kanojoは waガン ganのせいで noseide死(し)ん()だ() shinda。 She died of cancer. deathcancerillness~のせいで (because of, due to)がん vs 癌 (cancer in kana vs kanji)