求英语句子找错不要求改正只要告诉我为什么错了.1.AmongthedicoveriesmadepossiblebytheinventionofthetelescopetheyfoundthatdarkspotsexistedontheSuninvaryingnumbers.为什么“theyfound”错了?2.Norwegianwr

　　求英语句子找错

　　不要求改正只要告诉我为什么错了.

　　1.AmongthedicoveriesmadepossiblebytheinventionofthetelescopetheyfoundthatdarkspotsexistedontheSuninvaryingnumbers.

　　为什么“theyfound”错了?

　　2.NorwegianwriterSigridUndsetislikethenovelistSirWalterScottinheruseofhistoricalbackgrounds,butunlikehisbooks,shedwellsonthepsychologicalaspectsofhercharacters.

　　为什么“hisbooks”错了?