2）Sam Benton, the local butcher, had lost his wallet while took his saving to the post-office.（×）
Took→taking. While doing sth / 当…事情进行时
5）Sam found his wallet out of his front door.（×）
Out of→ outside. Outside somewhere是在某个空间外面， out of是介词，常和go这样的动词连用，表示走出某个空间。 She went out of the room. Get out of house!
6）It had been wrapped up by newspaper and it contained half the money he had lost, （×）
By→in, 钱包被包在报纸里，用in。
7）together with a note which says: 'A thief, yes, 'but only 50 per cent a thief!'（×）
Says→said, 过去时态
9）In time, all Sam's money were paid back in this way. （×）
were→was , Money不可数，单数
1. when时间点，或时间段都可以表示吧，while貌似只是时间段，强调主从句的动作同时发生。
2. on time是准时，比如飞机按计划准时出发，请准时参会，等等时候用吧。 in time是及时，你能及时把玫瑰花及时送到我女朋友那吗，这种表示恰好，刚好等意思时用in time。
不晓得理解的对不对~

2). Sam Benton, the local butcher, had lost his wallet while taking his savings to the post-office.(这里设两处错误，一处是while引导的时间状语从句，表示两个动作同时发生，从句要用进行时。主从句的动词主语是同一个时，从句的主语可以省略，即这里省略了he was。第二处是saving和savings的区别。)
5). Sam found his wallet outside his front door.(这里设置目的区别outside 和 out of,out of是介词短语，只有跟在实意动词如go,take,pull等连用。)
6). It had been wrapped up in newspaper and it contained half the money he had lost, (这里设置目的是区别用物包和被人包所用的介词不一样，或是理解钱包是包在报纸里面用in。)
7). together with a note which said: 'A thief, yes, 'but only 50 per cent a thief!'（一个句子或一篇文章时态应当一致）
9). In time, all Sam's money was paid back in this way.（Money是不可数名词，谓语应该是三单）。
回答一：while可引导两个动作同时发生，从句结构是while doing 或while sb be doing,这时也可以用as和when。When引导时间状语从句，从句的时间既可以是点，也可以是段。而while后的时间表达只能是段。总之，能用while和as的地方可以用when，反之不一定。
回答二：in time 是"及时，适时;迟早"的意思,意指正赶上时候或恰在需要的时候,在这里是"终有一天;最后";=in the end. 如: We were just in time to catch the bus.我们及时赶上了公共汽车.
on time是"准时;按时"之意。The train pulled in on time.火车准时到站了.

2.took改成taking；5.out of改成outside；6.by改成in；7.says改成said；9.were改成was，money是不可数名词。求助一：while理解是可以跟时间段，后面跟持续性动词，when是跟莫个时间点，后面跟短暂性动词；求助二：in time及时；on time准时。

求助1 while表示在于同时发生，而when表示当某一个挤时间。
求助2 in time 表示及时，on time 表示按时

when与连续性的或短暂性的动词连用，从句的动作与主句的动作有可能是同时发生，也可能是从句的动作发生在前，在表示两个动作同时发生时，可与while互换。While译为“在……同时”，“在…期间”，谓语动词要加延续性动词。in time 和 on time 意思不一样。in time是“及时、迟到”的意思；on time是“按时、准时”的意思。

while表示时间段强调主从句的动作同时发生,when表示某个时间点后跟短暂性动作;in time是及时，on time是准时

章景同学不仅题目编写的好，而且作了详尽的解释，方便大家学习。真棒！

设置的非常棒 让我学到了很多！