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%)
◆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.
◆如果有两个助动词,频度副词通常放在第一个助动词后面.如:
We have never been invited to one of their parties.他们聚会,一次也没邀请过我们.
She must sometimes have wanted to run away.她有时候一定想到过要逃走.