应该死 this bike is 因为主语是 this bike 谓语是 is
如:Is this bike yours?还原就是:This bike is yours.this is bike不行吗why？你好:如果问"是什么东西", 提问就应该是: Is this a bike? 回答: Yes, this is a bike. 如果问"是谁的东西" , 提问就应该是 : Is this bike yours ? 回答: This bike is Tom's . (或其他)可以是: this is bike 结构, 但是要根据不同的语境, 确定是否要加冠词.