獨立主格結(jié)構(gòu)主要表示謂語動詞發(fā)生的時間、原因、條件或伴隨情況等，相當(dāng)于一個狀語從句或并列句。??????

1. 用作時間狀語The work done (=After the work had been done), we went home. 工作完成后，我們就回家了。2. 用作條件狀語Weather permitting (=If weather permits), they will go on an outing to the beach tomorrow. 如果天氣允許的話，他們將在明天組織一次海濱小游。3. 用作原因狀語An important lecture to be given tomorrow (=As an important lecture will be given tomorrow), the professor has to stay up late into the night. 因為明天要發(fā)表一個重要的演講，教授不得不熬夜到很晚。4. 用作伴隨狀語He was lying on the grass, his hands crossed under his head (=and his hands were crossed under his head).他躺在草地上，兩手交叉枕在腦后。
　　
表示補(bǔ)充說明一個獵人走了進(jìn)來，他的臉凍得通紅We redoubled our efforts, each man working like two. 我們加倍努力，一個人干兩個人的活。注：獨立主格結(jié)構(gòu)表示時間、條件或原因時，相當(dāng)于一個狀語從句，一般放在句首，表示原因時還可放在句末；表伴隨狀況或補(bǔ)充說明時，相當(dāng)于一個并列句，通常放于句末。