什么时候用always,often,usually,sometimes,seldom,rarely,never,请详细说

什么时候用always,often,usually,sometimes,seldom,rarely,never,请详细说明,
He always brushes his teeth after meals.
She ____brushes her teeth
They ___brush their teeth.
He ____brushes his teeth.
She ___brushes her teeth.
I brush my teeth.
I ___brush my teeth.

always,often,usually,sometimes,seldom,rarely,never全部是频度副词
always,usually,often,sometimes,seldom,rarely,never【然此顺序always频度最高 never从不 频度最低】
在线,不懂再问
再问： 上面题目的答案是什么，怎么用
再答： 如果每词只能填一次那就随便填吧，按常理来说人每天都该刷牙，都应该填always（总是）不是吗～～ 满意的话请采纳～～
再问： 那是不是所有的都用always
再答： 你觉得题目中的（比若说I ___brush myteeth 的那个I不每天刷牙）那你就不填always 填often 什么的～～