新概念英語第二冊語法Lesson 3 Please send me a card

Postcards always spoil my holidays.
     這句話的主語postcards是使用零冠詞來修飾的， 通常我們用零冠詞來修飾復(fù)數(shù)可數(shù)名詞或不可數(shù)名詞， 表示類別和概念。
     Boys and girls study together in most schools.
     Dogs are our best pets and friends.
     Time speeds by.