英語的一個顯著特徵是它可輕易地把簡單結構(一箇中心意思)轉化爲複合結構(兩個中心意思)和複雜結構(一箇中心意思和一個從屬意思)甚至轉化爲複合-複雜結構(兩個或以上的意思)。主句，又稱獨立句，表達可獨立成句的思想內容。從句，又稱非獨立句，表達不能獨立成句，而需與主句一起構成完整的思想內容。達到句式多變的最佳期途徑是把關鍵詞或短語換到開頭或結尾，從中發現達到你的目的和適合你的品味的最好方法。通過連接短句-省詞，增詞，改變詞序或把不那麼重要的思想放到從句中去-你就可以寫出更流暢，成熟的句子。 例:【原】Lu Hao graduated last summer. He joined the First Auto Works in Changchun soon after graduation. He received an engineering degree from his college. 採用從句能將這三個簡單句以不同方式連接起來。 【改1】After graduating last summer with an engineering degree, Lu Hao soon joined the First Auto Works in Changchun.(介詞結構+主語+謂語)【改2】An engineering degree-holder, Lu Hao joined the First Auto Works in Changchun last summer soon after graduation.(同位語+主語+謂語+狀語)【改3】Having graduated with an engineering degree, Lu Hao joined the First Auto Works in Changchun last summer.(狀語+主語+謂語）
