i improve my English by practicing speaking English.和i improve my English through writing有何区别?

问题描述:

i improve my English by practicing speaking English.和i improve my English through writing有何区别?
还有就是through和by的用法有什么区别?什么时候用through,什么时候用by?

practicing speaking 和 writing 是不同的.一个是说,另外一个是写.
Through 是经过.但by 是由.
翻译过来是:
我改善我的英语经过讲话.我改善我的英语由写字.