some過去分詞是什麼

該詞沒有過去分詞，例如：

1、There have been some problems but basically it's a good system.雖然出現過一些問題，但這基本上仍不失爲一個好系統。

2、There are some obvious practical applications of the research.這項研究有一些明顯的實際用途。

3、I had some idea of what the job would be like.我對於這份工作有了一些瞭解。