巧妙辨析since和for区别

Since 用于表示从某个时间点或事件开始的一段持续时间，强调的是时间点或事件。 For 则用于表示一段确定的时间长度，强调的是时间长度。
Since 的用法
Since 后接时间点或事件，如：
- I have been working here since 2010.
- She has been sick since last week.
Since 也可用于表示一段持续至今的时间，如：
- I have known her since she was a child.
For 的用法
For 后接时间长度，如：
- I have worked here for ten years.
- She has been sick for three days.
For 也可用于表示一段持续了一定时间但现已结束的时间，如：
- I lived in New York for five years.
- We waited for an hour but the bus didn't come.
常见误区
一个常见的误区是将 since 和 for 互换使用。 这是错误的，因为这两种介词具有不同的含义和用法。 例如，以下句子是错误的：
- I have been working here for I was young. (正确写法：since I was young)