1.Thefactorywhere/inwhichIworkisverybig.
2.Englishisthelangugeinwhichhewritesletters.
3.Thebuilding(which/that)theyarebuildingnowisourschool.
1.ThisisahugefactorywhichI'mworkingin.
2.HewritesletterinEnglish.
3.Thebuildingisbeenconstructingthatbelongstomyschool.
1.我工作的这家工厂很大ThefactorywhereIworkisverybig.
2.英语是他写信用的语言。Englishisthelanguageinwhichhewritesletters.
他们正在建的这个大楼是我们学校。
Thebuilding(that/which)theyareconstructingisourschool.
Thefactoryinwhichiworkisverybig.
Englishisthelangugethathewritedletters.
Thebuildingwhichtheyarebuildingisourschool.
Thebuildingwhich/that/-theyarebuildingnowisourschool.