1.Two men主語(yǔ) took謂語(yǔ) the parcel賓語(yǔ) off the plane介詞短語(yǔ)作賓補(bǔ) and并列連詞 carried謂語(yǔ) it賓語(yǔ) into the Customs House介詞短語(yǔ)作賓補(bǔ).
2.While連詞（時(shí)間狀語(yǔ)從句） two detectives主語(yǔ) were keeping guard at復(fù)合謂語(yǔ)（過(guò)去進(jìn)行時(shí)態(tài)） the door賓語(yǔ),（主句）two others主語(yǔ) opened謂語(yǔ) the parcel賓語(yǔ).
3.To surprise介詞短語(yǔ)作修飾句子的狀語(yǔ),the precious parcel主語(yǔ) was系動(dòng)詞 full 表語(yǔ) of stones and sand介詞并列短語(yǔ)作表語(yǔ)的補(bǔ)語(yǔ).