At this, the police pointed out ironically 请专业人士回答，谢谢，

Question

At this, the police pointed out ironically that this would hardly be necessary as the men were already under arrest.
这里的that是什么从句? .as状从里under arrest是表语吗
2. Pretending to speak seriously, one of the workmen asked if he might make a telephone call before being taken to the station.
这句是ing分词短语作什么语？ if是宾从吗 before引导的是不是从句？
3. Only when he saw that the man was actually telephoning the police did he realize that they had all been the victims of a hoax.
这里when是状从那第一个that 是宾从吗 第二个that也是宾从吗
请给我把从句都划分出来，我分的多个谓语，谢谢了，

Answer 1

1. that 引导的是宾语从句，under arrest是表语。
第一个句子里有两个从句，第一个是that引导的宾从（that...arrest)，里面又包含了as引导的状从
2.ING分词做状语，表目的。if 是宾语从句。before后接的不是从句，是接了动名词的被动形式做before的宾语。
只有一个由if引导的宾语从句（if...station）
3. 第一个that是宾从，第二个也是宾从。
这个句子有三个从句，第一个是when引导的时间状语从句（when...police)，这个状从里有个宾从，解释saw的内容（that...police），滴单个从句时realize的内容（that...hoax）追问

2.before前面不是有宾语吗，那不是两个宾语了，后面的介词短语作状吗
3.only再状从前面不是应该倒装吗， 主句应该是when did he realize that ，是不是he saw 宾从是插入语，

Answer 2

the hoax. Inviting the fire brigade to put out a nonexistent fire isthe youth with delight， as this 谢谢你了，父亲，那就给我一只笨