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1. To get the attention of these young viewers, commercials use child actors. They help the students understand their familys shopping and household expenses as well.【考点】以上两个句子中的child和household都是名词作定语，修饰其后面的名词，说明被修饰名词的“性质、属性”。一般作定语的名词都用单数，只有 man 和woman 等作定语时，随着被修饰名词的数变化，如：a woman teacher, two women teachers。【考例】 The ________ is just around the corn……