在message letter sign news notice等词后要用现在分词作定语 不用过去分词

过去分词或者现在分词作后置定语在意思上相当于一个定语从句，主动的一般是现在分词，被动的一般是过去分词。
比如：The first textbook written for teaching English as a foreign language came out in
What's the language spoken in Germany?
Most of the people invited to the party were famous scientists.

There was a girl sitting there.
The farmers working here are very busy.
有时候是曲折变化的ing 词作定语，那已经失去了主动与被动最初的意义，就当形容词用，比如：
There is nothing interesting.