分析以下句子的语法，并确定该句子是否具有语法错误: "My favorite hobbies are reading, swimming, and to cook." 


My favorite hobbies are reading, swimming, and to cook.
该句子的语法是“主语+谓语+表语”结构，其中谓语是“are”，主语是“my favorite hobbies”，表语是三个名词性短语，分别是“reading”、“swimming”和“to cook”。该句子中存在语法错误，因为不应用“to”作为不定式短语“to cook”的一部分，正确写法应该是“My favorite hobbies are reading, swimming, and cooking.”