专家老师：你好！
关于forall 含义，使用方法的疑惑：
1）马克吐温小说：原文如下：
https://www.gutenberg.org/files/3174/3174|h/3174|h.htm#ch2 《A DOG'S TALE》
WhenI was well grown, at last, I was sold and taken away, and I never saw heragain. She was broken|hearted, and so was I, and we cried; but she comforted meas well as she could, and said we were sent into this world for a wise and goodpurpose, and must do our duties without repining, take our life as we mightfind it, live it for the best good of others, and never mind about the results;they were not our affair. She said men who did like this would have a noble andbeautiful reward by and by in another world, and although we animals would notgo there, to do well and right without reward would give to our brief lives aworthiness and dignity which in itself would be a reward. She had gatheredthese things from time to time when she had gone to the Sunday|school with thechildren, and had laid them up in her memory more carefully than she had donewith those other words and phrases; and she had studied them deeply, for hergood and ours. One may see by this that she had a wise and thoughtful head, forall there was so much lightness and vanity in it.
最后一句：for all there was so much lightness and vanity in it. | 这里的for all + 句子，是什么含义？使用方法？
2）对比：
有中国老师将马克吐温小说改写成：
Andalthough we dogs would not go there，to do well and rightwithout rewards would give our short lives worth and dignity，which initself would be a reward.
Shehad gathered these things from time to time when she went to the Sunday|schoolwith her children,and had laid those words and phrases up in her memory morecarefully than ever.
Andshe had studied them deeply, for her good and ours. One may see from this thatshe had a wise and thoughtful head,
butfor all there was so much lightness in it.
|这里的but forall 中的forall 如何剖析和理解含义？使用方法？
3）另外，我还看到如此的而句子：
Hemay leave at once for all I care.
Forall I care, you can throw it away.
Youmay go even now, for all I care.
Youcan go whenever you like for all I care.
Hemay be dead for all I know.
Itmight have been tomato soup for all we knew.
RichardNixon sends me alone, cut off from communications. For all he knew, I was goingto sell Alaska.
这里出现的forall I care, for all I know, for all we knew, for all he knew 中出现的for all: 又是什么含义？什么使用方法呢？
谢谢老师！
这个让步使用方法目前书本可能介绍较少，80年的《英语句式解析》有说明，录如下：
另外例句：He is still poor for all that he has worked so hard.
