Question

4．飛機起飛前，乘務(wù)員的職責之一就是確保所有乘客都系好安全帶．（ensure）Before the plane takes off，one of the flight attendants duties is to ensure that all the passengers have fastened their safety belts．．

Answer 1

分析 Before the plane takes off，one of the flight attendants duties is to ensure that all the passengers have fastened their safety belts．

解答 Before the plane takes off，one of the flight attendants duties is to ensure that all the passengers have fastened their safety belts．
這是描述的乘務(wù)員的基本職責，所以用一般現(xiàn)在時．
本句可用before引導(dǎo)一個時間狀語從句，主句中用動詞不定式作表語，that又引導(dǎo)一個賓語從句，作動詞ensure的賓語．take off起飛，fastened one's safety belts系好某人的安全帶．

點評 主從復(fù)合句的運用能夠更生動形象的表達出句子的意思，同時也能夠?qū)⒂⒄Z句式的表達提升到一個新的高度，所以對于復(fù)雜句式及非謂語動詞的練習與運用還需要進一步加強．