usually/ sometimes/always/often等詞在英文中被稱為“頻度副詞”,是用來表示動作頻率的,但程度上有別.常見頻度副詞按頻率大小排列如下：always(100%)>usually(80%)>often(60%)>sometimes(40%)>seldom(20%)>never(0%)◆頻度副詞在句中習慣上位于be動詞、助動詞等之后,行為動詞之前.1.在be動詞之后.如：She is sometimes very busy.她有時很忙.2.在第一個助動詞或情態(tài)動詞之后.如：I will never forget this lesson.我將永遠忘不了這一課.3.在實義動詞之前.如：We often go there.我們常去那兒.◆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.她有時候給我寫信.She writes to me often.她經(jīng)常給我寫信.◆如果有兩個助動詞,頻度副詞通常放在第一個助動詞后面.如：We have never been invited to one of their parties.他們聚會,一次也沒邀請過我們.She must sometimes have wanted to run away.她有時候一定想到過要逃走.
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