speedquick
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为什麼要用by? Combine the following pairs of sentences,using present or past participle. 1.He felt tired.He took a rest. Ans:Feeling tired,he took a rest.为什麼这句有逗号不用用by而 2.I have borrowed the book.The teacher has recommended it.这句要用by? 3.We were able to find the boy.He was hiding behind a tree. Ans:We were able to find the boy hiding behind a tree.而这句答案为是这样?