本句是用的分词吗？

1. when questioned at the meeting by my boss
=when I was questioned at the meeting by my boss
2. 这种语法在英语中被称之为状语从句的省略.
3. 状语从句的省略条件:
1). 从句主语与主句主语相同/从句主语是it
2). 从句主语的谓语动词以be动词开始
如果以上两个条件同时符合,就可以把从句的主语和be动词同时省略.此种现象常用于时间/条件/让步状语从句,连词一般有when/while/once/if/unless/though/although等.
4. 你的例句省略:when (I was) questioned at the meeting by my boss
再举些例子:
1) If (it is) possible, I'll help you tomorrow.
2) Although (he was) in his sixties, he could run fast.
3) Once (I am) invited, I'll go there at once.
5. 这句用的是过去分词的形式,但是它只是简单的被动语态结构:be+Vpp中的Vpp(过去分词), 而不是什么"过去分词短语(动词非谓语形式)做状语"这种语法.
6. 1)It shames me to say it和I told a lie when questioned at the meeting by my boss. 是两个用but连接起来的并列句.
2)后句的主句是: I told a lie
（时间状语）从句是：when （I was）questioned at the meeting by my boss

这里是分词表示被动： 我被老板询问的时候