be up(intr)起床了: Don’t expect her to answer the doorbell at eight o’clock on Sundaymorning.She won’t be up. 星期日早上8點(diǎn)鐘時(shí),別指望她聽見門鈴響會(huì)來(lái)開門。她那時(shí)還沒有起床呢。 be up to(tr)體力或智力足以……(賓語(yǔ)常用it,但也可用動(dòng)名詞): After his illness the Minister continued ...