1.主语是Bases,supplying such raw materials 是修饰语,修饰主语,are also to be expanded是表语.主干是Bases are to be expanded.2.Ordering tickets 是主语,主干是Ordering tickets is a convenience....
1.Bases supplying such raw materials are also to be expanded. 主语Bases;谓语are also to be expanded;定语supplying such raw materials 这里的谓语是用的是be to do结构的被动语态形式be to be done be to do 结构有至少两种用法: