always, usually, sometimes, never (A1)

这些词表示多久一次，从次数最多到最少： always — 每一次 usually — 几乎每一次 often — 很多次 sometimes — 有些日子，不是大多数 rarely — 几乎从不 never — 一次也没有

每个词表示多高的频率

I always brush my teeth. (every day)
She usually walks to school. (almost every day)
We often eat rice. (many days)
He sometimes plays games. (on some days)
We rarely eat out. (almost never)
They never drink coffee. (not one time)
Not "sometimes = every time" — say "sometimes = on some days, not most". sometimes 在中间：比 never 多，比 often 少。
试一试: Which word means on some days, but not most days? (sometimes / always / never) 答案: sometimes — 如果你选了 always 或 never，那是两个极端：always 是每一次，never 是一次也没有。sometimes 在中间：有些日子，不是大多数。

像 always、usually、often、sometimes、never 这样的词表示频率，要放在动作词前面。

She eats breakfast. → She always eats breakfast.
They watch TV. → They never watch TV.
I play tennis. → I sometimes play tennis.
Not "I eat always breakfast." — say "I always eat breakfast.". 表示频率的词放在动作词（eat）前面，不是后面。
试一试: She wakes up early. 把这些词排好顺序。答案: She usually wakes up early. — 表示频率的词就放在动作词前面：She usually wakes up early. 不是 "She wakes up usually early."

但如果是 am、is、are，这个词要放在 be 动词后面。

She is late. → She is usually late.
I am happy. → I am always happy.
They are busy. → They are often busy.
Not "She always is late." — say "She is always late.". 遇到 is，表示频率的词放在它后面，不是前面。
试一试: He is late. 把这些词排好顺序。答案: He is often late. — 在 be 动词 is 后面接上表示频率的词：He is often late. 遇到 am/is/are，这个词放后面，不是前面。
试一试: Before the action word, but after the verb be. Lars ___ tired in the morning. (is always / always is) 答案: is always — "Tired" 跟着 be 动词 is 一起用，所以表示频率的词放在它后面：is always tired.（动作词前面，但 am/is/are 后面。）