imperfect tense

Instead of considering the imperfect tense as a specific tense , consider it as a time reference.

我们最好不要将未完成式视为一具体时式, 而是视之为一参考性质的时间座标.

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。

If the main verb is in the past tense, the imperfect will be translated as a past.

（拉丁文）主要子句的动词为过去式，则（拉丁文）附属子句的未完成式动词要译成英文的过去式。