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there is引导的限定性定语从句
there is或there has ever been等结构作“目前有的”“曾经有过的”解时，可引导限定性从句，置于被修饰的词后面，作主语的关系代词that，who，which常常省略，如：I must make full use of the time (that) there is left to me.（我要充分利用剩下的时间。）
This car is probably faster than any of its kind (that) there has ever been.（这辆车可能比曾经有过的任何一辆车都要快。）
He was the only person (who) there was to witness the accident.（他是这次事故的唯一目击者。）
This car is probably faster than any of its kind (that) there has ever been.（这辆车可能比曾经有过的任何一辆车都要快。）
He was the only person (who) there was to witness the accident.（他是这次事故的唯一目击者。）
