Two pairs of trousers aremissing. 两条裤子不见了。 This pair of shoes isnot on sale. 这双鞋不出售。 8、主语部分含有pair of ;suit of 等短语时,谓语动词的数与pair,suit等保持一致。 如:On bed is a pair of socks. On bed are two pairs of socks. 9.large/bi...