Some farmers showed their farmer to Carol.应该是Some farmers showed their farm to Carol.或Some farmers showed their farmers to Carol.
Because hse thought it was interesting to milk a cow.您是想写Because he thought it was interesting to milk a cow.吧!
They were enjoy going for a walk.enjoy是动词,前面不该有be动词,应该为They enjoyed going for a walk.
Because the air is clean.时态应一致,Because the air was clean.
And the learned a lot about farming from farmers.您是想写And they learned a lot about farming from farmers.
They thought.if they can come the farm again.They will do more things what they didn't do.这里不用分句.They thought if they can come the farm again,they will do more things what they didn't do.
应该只有这么点,楼主要更细心一点哦!祝你好好学习,天天向上!