not only is experience the best teacher,but also we can lear

Not only is experience the best teacher,but also we can learn much things from failure这样的表达,单从语法上看,好像没有问题。不过,严格考察not only。。。but also 的用法,可知,它需要连接【对等成分】,即被连接的两部分在词性、结构形式和语用表达上,应该属于相同性质或近似性质的内容。而所给句子中,【is experience the best teacher】和【we can learn much things from failure】显然不属于对等结构。如果你坚持使用此语义和结构,建议改为类似这样的形式：Not only is experience the best teacher but also failure is the best friend who can give us a lot。 在你开心如意!O(∩_∩)O~~