4、eingdoneby...Peoplewereplantingtreesfromthepasttonow.Trees_____________________peoplefromthepasttonow.wereplantedbybeing5.一般将来时的被动构成:主语+willbe+doneby…e.g.We_______________if we break the rules.(将被惩罚punish)willbepunished6.过去将来时的被动构成:主语+wouldbe+doneby…7.现在完成