1、Having been tested many times, we found these instruments good in quality.

2、Although they are old, but they are still working hard at the research.

3、The people you know well are now working in the farm.

4、Please note the direction which the saloon car is going.

5、Don’t forget to visit the house in which you six once live before.

6、These gifts are to be given to those, who have made good progress.

请各位帮忙看看这几句改错怎么改啊

首先说明，最近被人带的语法不敏感了。回答仅做参考。顺便问下：这个是专业改句那种练习还是普通的从文章中的改句。

1. 逗号前是独立主格。也就要求后面是个完整的句子。we found (that) 这里是个宾语从句，但是从句中少谓语。可以改成：we found (that) these instruments are of good quality.或者we found these instruments are good in quality.

2. although 和but 随便去掉一个。两个分句只需要一个连接词。

3. 没有上下文其实挺难断定具体什么地方有问题，如果只有改一处的话，on the farm更加常规一点。

4. to which吧。

5. lived。

6. 如果用宽松的语法看，这句没有大问题，用严格的看，要把逗号去掉。good可以去掉，在部分语境下可能有redundant的嫌疑，没有上下文就难以确定了。

tks

第一句主语是instruments, 不是we.
第二句Although /but去掉一个
第三句The 改those
第四句which 改where 或者going 后面加个to

第五句，后半句时态错了，应该是you six  lived before. 最后一句逗号要去掉

xx find xx adj.用法没错的，比如I find this book interesting,没有必要一定要变成从句