My mother is cooking.是一个主谓结构的简单句。具体成分是：
My mother是主语(也可把看作是定语，修饰名词mother)
is 是助动词，cooking是现在分词， is cooking共同构成谓语部分.
类似的句子还有：
1、Mary is dancing.
2、Tom is walking.
3、Alice is swimming.
My mother is cooking.是一个主谓结构的简单句。具体成分是：
My mother是主语(也可把看作是定语，修饰名词mother)
is 是助动词，cooking是现在分词， is cooking共同构成谓语部分.
类似的句子还有：
1、Mary is dancing.
2、Tom is walking.
3、Alice is swimming.
