It's difficult to keep the format fresh when, as a tried and tested formula, it's now approaching staleness.这个句子怎么分析，特别是when, as, 两个逗号。
over加数词用法 over twenty people were seriously injured in the traffic accident over加数词时是介词吗 感觉加了数词是定语修饰prople 但介词短语做定语不是后置的吗
a kitchen and dining room combined这里combined作的是定语吗？作的是谁的定语呢？
我明白for可以表对象和用途，一般作后置定语如果表达“BBC的记者” 用the reporter for BBC还是 the reporter of BBC？为何？还是说两者可以互换？
Attached is an email they received which shared in vitro data. 这句话 they received和which shared in vitro data是不是都是修饰email？两个which 的定语从句能不能修饰一个先行词？
I know the man with a knife in hand.老师，这个句子的独立主格充当句子的定语吗？独立主格一般在句子中充当状语，还有其它用法？表语……等