这句话有语法错误吗

From what I mention above ,the go hiking not only can make me breathe fresh air,but also let me keep happiness.这句话有语法错误吗

是的，这句话有一些语法错误。应该改成：

"From what I mentioned above, going hiking not only allows me to breathe fresh air, but also helps me maintain happiness."

修改后的句子加上了动词“allows”，并且用“helps”代替了“let”，同时也修正了冠词和时态的错误。

Firstly,I enjoy breathing in fresh air while hiking,which help me feel relaxed.Secondly,I felt very happy when I was attracted by the nature,my boring will go with the wind.这句话有什么需要改正的吗

有一些需要改正的地方，应该改成：

"Firstly, I enjoy breathing in the fresh air while hiking, which helps me feel relaxed. Secondly, I feel very happy when I am surrounded by nature, and my boredom goes away with the wind."

改正后的句子，修复了几个错误。首先，“fresh air”应该加上冠词，变成“the fresh air”。其次，“which help”应该改成“which helps”，因为“breathing”这个动作是单数形式。最后，“when I was attracted by the nature”应该改成“when I am surrounded by nature”，因为在hiking的时候，你会不断地被自然景观包围着。