[观察例句]
写出下列句中动词ed形式的作用
①We should drink boiled water. 前置定语
②A water and soil conservation project set up in 1989 resulted in farmers replacing their crops with trees or grass.后置定语
③Seen from the moon，the earth，with water covering about 70% of its surface，appears to be a blue ball.时间状语
④Frightened by the thunder and lightning in the night，the girl did not dare to sleep alone in her room.原因状语
⑤Given another chance，he will do it better.条件状语
⑥ The boy sat at the table buried in his homework.伴随状语
⑦We need to get the machine repaired at once as we want to use it in our experiment tomorrow.宾语补足语
⑧ With all the work done，we went to play basketball. 宾语补足语
