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频度副词
1.定义usually/ sometimes/always/often等词在英文中被称为“频度副词”，是用来表示动作频率的，但程度上有别。常见频度副词按频率大小排列如下：
always（100%）>usually（80%）>often（60%）>sometimes（40%）>seldom（20%）> never（0%） 2.频度副词的位置
◆频度副词在句中习惯上位于be动词、助动词等之后，行为动词之前。 1. 在be动词之后。如：
She is sometimes very busy. 她有时很忙。 2. 在第一个助动词或情态动词之后。如：
I will never forget this lesson. 我将永远忘不了这一课。 3. 在实义动词之前。如：
We often go there. 我们常去那儿。
◆sometimes也可放在句首、句中或句末，often也可放在句末（一般不放在句首）。如：
Sometimes she writes to me. =She writes to me sometimes. 她有时候给我写信。
She writes to me often. 她经常给我写信。
一、将频率副词填入适当得位置。 1. Lisa helps her mom at home. （usually）
__________________________________________________ 2. Jack is late for class. （never）
__________________________________________________ 3. He goes to school at 7:00 every morning. （always） __________________________________________________ 4. On weekends, my father takes us to the movies. （sometimes） __________________________________________________
5. My brother gets good grades at school. I am proud of him. （often） __________________________________________________ 6. Thereis good news on TV. (seldom)
__________________________________________________ 7. Is Mr. Wang on time? (always)
__________________________________________________ 8. Does Tom play basketball after school? (often)
__________________________________________________ 9. Ben plays baseball with his friends on weekends. (sometimes) __________________________________________________ 10. My sister is happy at school. (always)
__________________________________________________ 11. She __________ in her bed, but it is not good to her eyes. (A) always sleeps (B) never studies (C) often studies (D) seldom sleeps
12. He __________hungry after school, sohe eats a snack before he goes home.(A) is never (B) always is (C) never is (D) is always 13. A: What do you usually do on weekends? B: ______________________________.
(A) I usually visit my grandmother. (B) I never watch TV on weekends.
(C) I seldom visit my grandfather. (D) I usually don’tgo to the zoo.