as well as 以及
海倫以及她的兩個姐妹都很期待即將來臨的假期.
補充
not only A but also B + be動詞→此be動詞形態由"B"決定
ex: Not only you but (also) I am to blame.
Helen as well as her two sisters _______..-阿摩線上測驗