摘要：3．有些无生命的集合名词作主语.谓语用单数. All the furniture in my room is new. 我房间里的家具都是新的. Warm clothing is necessary in cold climates. 在寒冷的气候中.保暖的衣服是必需的. The machinery is driven by electricity. 这些机器是由电力驱动的. Has your luggage arrived yet 你的行李已经运到了吗? A lot of hiking equipment is needed here. 这里需要大量徒步旅行的装备. C． 代词作主语

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