never,frequently,rarely,always,sometimes这些都叫什么词?

never,frequently,rarely,always,sometimes这些都叫什么词? rar是什么 请问英语高手 never,often,sometimes,rarely,always,frequently以上单词有哪几种再碰到第三人称时动词不变? RAR压缩文件到期是什么意思 acad.rar是什么 rar是什么意思啊? rar是啥意思 rar文件是啥? RAR什么意思 RAR恢复什么意思 怎么打开windows rar 海信空调的rar是什么意思 good luck.rar是不是病毒 good luck.rar 是什么文件 RAR.是啥咱是个无知的孩子. RAR什么意思求解答 求这几个频率副词的排序always,usually,often,sometimes,seldom,hardy ever,occasionally,never,frequently ,all the time,rarely,at times our teacher frequently collects our exercise bookswe never work after six o'clockwhat a lot of trouble he is causing翻译的通顺点