1. 用于复数名词前复数名词泛指某类人或物时，其前通常用零冠词。如：Students should obey the school rules. 学生应该遵守校规。Trees don't grow in the Antarctic. 南极不长树木。【说明】复数名词若需特指，则要加定冠词。如：The students are too lazy. 这些学生太懒。2. 用于不可数名词前不可数名词表示泛指时，其前通常用零冠词。如：Bread is made from flour. 面包是用面粉做的。Wood is a poor conductor of sound. 木头是声音的不良导体。【说明】不可数名词若需特指，则要加定冠词。如：He sawed the wood into three pieces. 他把木头锯成三块。3. 用于专有名词前在通常情况下，专有名词前要用零冠词。如：Mr Smith is our English teaches us English. 史密斯先生教我们英语。【说明】在特殊情况下，若专有名词需要特指，也可加定冠词。如：The Smith you're looking for no longer lives here. 你找的那个史密斯不再住这里。...