So, forexample, myniecewillattendyourschoolthissummersothatshecanimproveherEnglish.
Or I wenttoSwitzerlandforthreeweeksso I couldlearntoski.
Thirdly, indefiningrelativeclausesindefiningrelativeclauses, weoftenusetherelativepronounthatas a replacementforwhoorwhichtorepresent a personor a thing.