.现在分词: doing, having done, being done, having been done过去分词: doneDoing, being done时间1. Walking along the street, I met Mary. (= While I was walking along the street.)原因2. Being tired, I stopped to take a rest.(= Because I was tired, .)条件3. Turning to the left, you will find the school. (= If you turn to the left, .)让步4. Knowing where I live, he never come to see me .(= Though he knows where I live, .) 伴随5. I stood there, waiting for her. (= , and waited for her.) 结果6. It
