划线的sound为什么要加s

划线的sound为什么要加s That sounds good的sound为什么要加s?直接sound不好了 sound为什么有时加s 为什么sound后加s That sounds good.这里的sound为什么要加s?在什么时候又不加s 英语翻译答案是sound+s,interest+ing,为什么要加? 4题,sound为什么要加s,急, That ___ very interesting.A sound B not sound C does sound D sounds声音后为什么要加s？ 第八题sound为什么加s my english teacher's voice sounds中sound为什么要加sMy English teacher's voice sounds nice and gentle sound为什么加s 名词sound加s? Sound什么时候加s no sound为什么不加s His lisened carefully,but there was no sound in the room 为什么不加s还有voice和sound的区别sometime为什么是某时 light is(thousands of times)faster than sound.为什么time要加s? 是 sound good 还是sounds good.如果后者为什么要加s 为什么Playing computer games sounds relaxing中的sound要加s? That sounds boring.为什么sound加s啦 the song sounds very nice中,sound为什么加s?