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usually“通常”和often“经常”被我们称为频率副词。初中阶段常见的频率副词还有always, sometimes, hardly(ever)， never等。频率副词的用法有以下几点值得注意：
A）频率副词在句中的位置常放在实义动词前，be动词、情态动词及助动词之后。但sometimes的位置较为灵活，可位于句首、句中或句末。
They are always late for school. 他们总是上学迟到。
He has never been there. 他从来没去过那里。
Sometimes Tony goes to school by bike. 托尼有时骑自行车去上学。
B）对频率副词提问通常用how often这一短语,意为“多久一次”。
Li Ming usually does his homework after supper. (对划线部分提问)
How often does Li Ming do his homework after supper?
C）我们可将频率副词按频率从高到低的排列顺序，用百分率表示为：
always=at all times表示“总是，永远”之意，相当于100%的频率。
usually=in most cases表示“通常，惯常”之意，相当于90%的频率。
often=many times表示“多次，经常”之意，相当于80%的频率。
sometimes=at some times but not all the time表示“有时候，偶尔”之意，相当于30%的频率。
hardly(ever)=almost never或very seldom表示“很少，几乎从不”之意，相当于百分之几或0%的频率。
never=at no time或not ever表示“永不，从未”之意，相当于0%的频率。
这里的百分数只是为了便于区分它们所表示频率的程度而已，不能完全按这些百分率去理解。
另外，表示频率还可用一些副词短语来表示，如once a week一周一次，three times a year一年三次等。
Take this medicine after meal three times a day.
这药饭后服用，一日三次。
——How often do you go shopping? 你多久购物一次？
——Once a week. 每周一次。
【跟踪练习】
选择填空：
1. He ____ goes to bed too late, because he has to get up early every day.
A. always B. never C. usuallyD. sometimes
2. ——____ does Tom write a letter to his parents?
——Twice a month.
A. How often B. How many times
C. How soon D. How long
3. They are going to stay here for ____.
A. sometime B. sometimes C. some time D. some times
4. He hardly has lunch at home, ____?
A. does he B. doesn’t he C. has he D. hasn’t he
5. She always finishes her homework on time. She ____ leaves it for tomorrow.
A. always B. never C. usually D. sometimes
Key（4）
A）频率副词在句中的位置常放在实义动词前，be动词、情态动词及助动词之后。但sometimes的位置较为灵活，可位于句首、句中或句末。
They are always late for school. 他们总是上学迟到。
He has never been there. 他从来没去过那里。
Sometimes Tony goes to school by bike. 托尼有时骑自行车去上学。
B）对频率副词提问通常用how often这一短语,意为“多久一次”。
Li Ming usually does his homework after supper. (对划线部分提问)
How often does Li Ming do his homework after supper?
C）我们可将频率副词按频率从高到低的排列顺序，用百分率表示为：
always=at all times表示“总是，永远”之意，相当于100%的频率。
usually=in most cases表示“通常，惯常”之意，相当于90%的频率。
often=many times表示“多次，经常”之意，相当于80%的频率。
sometimes=at some times but not all the time表示“有时候，偶尔”之意，相当于30%的频率。
hardly(ever)=almost never或very seldom表示“很少，几乎从不”之意，相当于百分之几或0%的频率。
never=at no time或not ever表示“永不，从未”之意，相当于0%的频率。
这里的百分数只是为了便于区分它们所表示频率的程度而已，不能完全按这些百分率去理解。
另外，表示频率还可用一些副词短语来表示，如once a week一周一次，three times a year一年三次等。
Take this medicine after meal three times a day.
这药饭后服用，一日三次。
——How often do you go shopping? 你多久购物一次？
——Once a week. 每周一次。
【跟踪练习】
选择填空：
1. He ____ goes to bed too late, because he has to get up early every day.
A. always B. never C. usuallyD. sometimes
2. ——____ does Tom write a letter to his parents?
——Twice a month.
A. How often B. How many times
C. How soon D. How long
3. They are going to stay here for ____.
A. sometime B. sometimes C. some time D. some times
4. He hardly has lunch at home, ____?
A. does he B. doesn’t he C. has he D. hasn’t he
5. She always finishes her homework on time. She ____ leaves it for tomorrow.
A. always B. never C. usually D. sometimes
Key（4）