PING-PONG 等词为什么要加-

PING-PONG 等词为什么要加- ping-pong中的-是什么意思 ,为什么又要加“—” ping pong 就是乒乓球的意思 为什么还要加ballI can play ping-pong.不加. Do you have a ping-pong ball ?问句中为什么又要加. ping-pong 为什么乒乓球的英文名是ping-pong? 为什么To play ping-pong isinteresting在play前加to 什么时候要加ing,如:Tom and Mike like playing ping-pong. they had much fun piaying ping-pong为什么要用much?xiexie They often play ping-pong on weekends.（对play ping-pong提问） 为什么要写they often do on weekendsThey often play ping-pong on weekends.（对play ping-pong提问） 为什么要写what do they often do on weekends play ping-pong PING PONG怎么样 Ping pong is f________ 什么是ping pong email? 用ping-pong,us,after,let,class,play连词成句连词成句不可以加别的词!急 I play ping-pong with my classmates after class.为什么classmates加S打乒乓应该和一人打啊为什么加S? Why Ping Ping Pong is round can Bill play ping-pong( -Sure ping-pong is favorite. ping-pong和ping-pong ball的区别在哪里.