I don't know how to do this job.请详细讲解其中的每一个语法知识点,

I don't know how to do this job.请详细讲解其中的每一个语法知识点,
I don't know how to do this job.请详细讲解其中的每一个语法知识点,

I don't know how to do this job.请详细讲解其中的每一个语法知识点,
I don't know---我不知道
how to do----怎么做
此句是一个符合句,我不知道怎么做这项工作.How to do 本来是问句,但在这里充当了名词短语,做宾语

我不知道固定句式：I don't know.
怎么做某事：how to do sth

how to do 相当于名词。。。。。在句子中充当宾语

I don't know 是主句， how to do this job是宾语补足语。