题目内容：

I am writing to you about the talk I agreed to give at the local library in two weeks' time
这句话中为什么加about,还有week'是什么用法

优质解答

1.write to sb about sth 写信给某人谈及某事
2.two weeks' 是表时间的词的‘s 属格形式作定语,修饰time
再如：today's newspaper
two hours' walk