前邊的呢?句子不完整啊she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find."she turned a suitcase into a bed and put the children inside it"中，已經(jīng)有了句子主謂成分，所以不能再有其他主語，而cover這個動作的發(fā)出者也是she，這里是用動名詞引導(dǎo)的“covering them with all the clothes”來作伴隨狀語了。如果后面動作的發(fā)出者不是she，而是另一個人的話，比如Tom，那么會變成“she turned a suitcase into a bed and put the children inside it, Tom covering them with all the clothes she/he could find.”這樣就是獨(dú)立主格結(jié)構(gòu)了（當(dāng)然，這個變出來的句子不太合邏輯，不過獨(dú)立主格就是這樣的，順便記一下吧）如果第二句改成了Tom的話cover還是用加ing的形式嗎？那Tom前面不需要加be？