for的since的区别？举例说明。

Question

如题所述

Answer 1

在常见的for和since区别时就是用于完成时 记住一点for接时间段 而since接的时间点 就OK了 例：我知道这件事已经有三年了I have known it for three years. 等于：我三年前久已经知道这件事了 I have known it since three years ago.

而用于一般现在时的话 since几乎是不用的 for就是单纯的介词 连词用法 表原因 对象等 加油

Answer 2

for后加时间段，since后加具体时间点。
eg：I've been learning English for three years,because I began learning it since three years ago.

译：我学英语已经三年了，因为我从三年前开始学英语。
释：三年是时间段，三年前是时间点。

Answer 3

for 后面加时间点
we have lived in Beijing for three years
since后面跟时间段
we have lived in Beijing since three years ago.
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Answer 4

for后面加时间段 I have learned English for five years.
since后面加时间点 I have lived here since I was born
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Answer 5