F-01
always → never
从总是到从不💡 概念 Concept
Frequency adverbs tell how often something happens. Think of a scale: always (100%), usually (about 80%), often (70%), sometimes (50%), rarely (10%), never (0%).频率副词说明事情发生的频率。可以想成一条刻度：always（100%）、usually（约 80%）、often（70%）、sometimes（50%）、rarely（10%）、never（0%）。
📐 规则 Rules
高频
always 总是 · usually 通常 · often 经常
always 总是 · usually 通常 · often 经常
中频
sometimes 有时（约一半）
sometimes 有时（大约一半）
低频
rarely 很少 · never 从不
rarely 很少 · never 从不
never 即否定
I never drink coffee.（句中不再加 don't）
never 本身表否定，不再加 don't
✏️ 例句 Examples
She always smiles when she sees me.
她见到我总是微笑。
I usually get up at seven.
我通常七点起床。
He never eats meat.
他从不吃肉。
⚠️ 常见错误 Common Mistakes
❌ I don't never eat fast food. → One negative: I never eat fast food.❌ never 已是否定，别再写 don't：I never eat fast food.（我从不吃快餐。）
❌ She always is busy? → Wrong spot, see next phase: She is always busy.❌ always 放在 be 动词后面：She is always busy.（她总是很忙。）
F-02
Position 位置
频率副词的位置💡 概念 Concept
Frequency adverbs sit in one of three spots: before a normal main verb (I often read), after the verb be (He is always late), and between an auxiliary (can / do / will) and the main verb (I can never forget it).频率副词的位置有三条规则：一般动词前（I often read）、be 动词后（He is always late）、助动词（can / do / will）与实义动词之间（I can never forget it）。
📐 规则 Rules
实义动词前
I often read before bed.
我经常睡前读书。
be 动词后
He is always late for school.
他上学总是迟到。
助动词后
She can never forget that day.
她永远忘不了那一天。
sometimes 句首
Sometimes I walk to work.（也可放句首）
sometimes 也可以放在句首
✏️ 例句 Examples
We often play football after school.
我们放学后经常踢足球。
My mother is always busy on weekdays.
我妈妈工作日总是很忙。
I can usually finish my homework before dinner.
我通常能在晚饭前写完作业。
⚠️ 常见错误 Common Mistakes
❌ I read often books. → Often goes before the verb: I often read books.❌ often 放在动词前：I often read books.（我经常读书。）
❌ She is late always. → After be: She is always late.❌ always 放在 is 后面：She is always late.（她总是迟到。）
F-03
How often...?
多久一次？💡 概念 Concept
To ask about frequency, use How often + do / does + subject + verb? Answer with a frequency adverb, or with every day / week, once a week, twice a month, three times a year.询问频率用 How often + do / does + 主语 + 动词？回答时用频率副词，或用 every day（每天）、once a week（一周一次）、twice a month（一个月两次）、three times a year（一年三次）。
📐 规则 Rules
提问
How often do you exercise?
你多久锻炼一次？
every 表达
every day / every week / every morning
每天 / 每周 / 每天早上
次数表达
once a week · twice a month · three times a year
一周一次 · 一月两次 · 一年三次
✏️ 例句 Examples
How often do you exercise? I exercise three times a week.
你多久锻炼一次？我一周锻炼三次。
How often does he travel? He rarely travels.
他多久旅行一次？他很少旅行。
I brush my teeth twice a day.
我每天刷两次牙。
⚠️ 常见错误 Common Mistakes
❌ How often you exercise? → Need do: How often do you exercise?❌ 疑问句要加 do：How often do you exercise?（你多久锻炼一次？）
❌ I every day play games. → Time phrases go at the end: I play games every day.❌ every day 放在句尾：I play games every day.（我每天玩游戏。）