One thing you need to remember about the imperfect past tense& it is for activities that were ongoing or repeated; something you were doing in the past, or something you used to do. 你应该记住过去未完成式是指过去进行的或重复的动作,你在过去正在做的事或习惯的事。
Lacking of the awareness of protecting and saving resources, imperfect management system and the loose enforcement of related laws and regulations are the main causes of the tense human-earth relations in Putian. 缺乏资源的保护与节约意识、管理体制不完善、相关法律法规执法不严等是造成莆田人地关系紧张的主要原因。