there is nobody by that name working here.work为什么要加ing形式

there is nobody by that name working here.work为什么要加ing形式 Nobody here by that name here前面需要is吗? Is it working这里的work 为什么加ing. WORKING ON MATH PROBLEM 中的 WORK为什么要加ING by making 为什么加ing形式 Is there a passport here?最后为什么要加here? 为什么by后面要加动词ing形式? 难道by是介词? i don't believe in working too hard .work为什么加ing She doesn't like trawelling by play.为什么trawe要加ing形式?急! 选择：There is nobody here ( ) me . by 后面的动词要加ing形式吗 nobody is here today为什么is后面可以加副词啊?