While John was watching TV, his wife was cooking.

While John was watching TV,his wife was cooking.
主句：His wife was cooking
主句主语：His wife 谓语was cooking
从句：While John was watching TV 时间状语从句
从句主语：John 谓语was watching 宾语TV
简单说一下,要弄清楚句子的语素和含义：主谓宾表定状.
从句时对主语的修饰、限定或者补充说明,成分上作定语、同位语、状语或者名词性从句作表语、宾语、主语等.
从句前面一般有关联词来引导 关联词有：what that if because as ...,相反,如果一句话,比如：I like English that is interesting.主语 I 前面没有任何的关联词 所以 I like English 就是主句 剩下的就是从句.
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主句是
his wife was cooking
主句主语是his wife
从句是
While John was watching TV
从句主语是John
主句和从句的分辨方法：
一般情况下，when/while后跟的是从句，另外半句就是主句。

while John was watching TV是状语从句，John是其主语；his wife was cooking是主句，his wife是其主语。
通常带有从属连词的那个分句是从句。