diving,dine可数吗

diving,dine可数吗 diving diving dine in ,dine scuba diving Scuba Diving scuba diving The play began at eight,so they must dine at seven.at eight at seven 在句子中充当什么成分用连词so并列两个句子、the play ,they都是主语吗?must dine是动词吗? secret可数吗?secret秘密可数吗? News 可数吗News可数吗 tear可数吗?newspaper可数吗? feather 可数吗feather是不是可数名词~ pastry是否可数?pastry可数名词吗? weather可数吗 hot dog可数吗 orange juice可数吗? sugar可数吗 sugar可数吗