I think it is he who lets me know how to live a valuable life
如果你认为let是过去时的话,那么应该写成:I think it was he whol let me know how to live a valuable life.
She always encourages me and guides me to solving problems when I am in the sea
guide sb.to...(to是介词)
As it is known to all(word让我改成as all know it -·-!
word是这样的,凡事遇到被动语态它都建议你改成主动语态,所以不要理会它了.
If you are interested in anything about China,I will show you some Chinese custom.(your are 下面注了order of words.consider revising?)
这是让你注意词序,让你修改.因为你写了your are,这显然是错误的.