By what mode determines the manner in which something is being done. This phrase can be replaced by several synonyms such as how, in what way, by what means, or by what method. Using different phrases can help in expressing the same idea in various ways. "How" can be used for a more casual conversation while "by what means" or "by what method" is more formal. "In what way" can also be used to provide a clear understanding of the manner in which something was executed. By using synonyms, one can express their thoughts more effectively and choose the appropriate word depending on the nature of the conversation or writing.