Question

英语高手 请帮我看看句子语法

the most important quality is warm--hearted.
A warm--hearted person will help you to find out and overcome your shortcomings when you are in trouble.
Once I saw a group member falling into the water carelessly who was saved by me so early that keep his life.
不需要翻译，只帮我看看语法正确否

Answer 1

Once I saw a group member falling into the water carelessly who was saved by me so early that keep his life.
有问题。who was saved by me so early that keep his life 这个句子中关系代词时who,先行词应是I.
但是你的前半句主语是I, 后面就说who was saved,你 的主语已经换了。所以这个你用的乱了。
我觉得这样说比较好:
1.One day, a group member was seen fall into the water carelessly and was saved by me.(so that……就不用写了。如果接着写 应当说 his life was saved ，跟前面was saved by me就重复了。而且好像就某人的命我们说save one's life,而不说keep one's life)
注意一点的就是，我所用的这个句子是被动语态，因为要保证主语的一致。
也可以换做主动句，就是楼主的表达方法：
2.One day, i saw a group member fall into the water carelessly and i saved his/her life.这样写就可以了。
另外，我用的是one day 而不是once, 个人习惯问题老觉的用once 不是太顺口，楼主可以再多查查。可能是两个都可以用。
see后面可以跟两种时态， see sb doing sth/do sth. 根据具体情况使用。

Answer 2

最重要的品质就是善良、热心
一个善良的人会在你遇到麻烦时找到并帮你战胜你的缺点
有一次我看到了一个不小心掉进水里被我很容易的就上来的人

Answer 3

第二句不对，see sb doing sth 表示看见某人正做某事，如 I saw them playing soccer. 改：Once I saw a goup member calling for help in the water and I saved him.