Is what to do next in I don't know what to do next an object clause? Why?

Is what to do next in I don't know what to do next an object clause? Why?

Let's analyze it
The object clause is first a sentence, that is, it has to have a predicate verb. It is obvious that the infinitive of the verb is a non finite verb, and it is certainly not a sentence without a predicate. It is just an infinitive phrase as the object of know. Take a look at this sentence, I don't know what I will do tomorrow

Is what to do an object clause in I don't know what to do?
If what to do is an object clause, how can I always feel that this sentence has few components?
If what is the subject, there is less object after do. If what is the object, there is less subject
Who can help me analyze this sentence structure,
What's in a sentence

The answer on the second floor is wrong
What to do in I don't know what to do is obviously not a clause, certainly not an object clause!
First of all, a clause, as a complete sentence, should have a subject predicate?
To do is a verb infinitive
What is the logical object of the infinitive to do. The logical relation should be "to do what" means what to do. "To do" means "do", followed by the logical object "what" means "what". So the whole sentence can mean "I don't know what to do", What I'm talking about is "logical object" of to do, not "object". The meaning of "difference" is much different after two words. Logical object is a kind of logical relation, not grammatical relation. Grammatical relation is "what" as the object of know, and "to do" as the post attributive to modify "what"
Similarly, there is "there is nothing to worryabout". There is nothing to worry about. The logical and grammatical relationship of nothing to worryabout is completely similar to what to do
Of course, the relationship between the infinitive postpositive attribute and the modified component can have other logical relationships besides the above relationship, such as the subject predicate relationship
You must be able to understand the following sentences
In my family,my mother is always the first one to get up.
In my family, my mother is always the one who gets up the earliest
The logical relation of the first one to get up is subject predicate relation
The first is the subject. Get up is the predicate
The grammatical relation is: to get up as a post attributive modifies the first one

I don't know what to do

I don't know what I will do.