My first question:

Is sentence 2 a more formal expression while senteance 1 is an informal expression because the word `about` is dropped?

Could we say the sentence 1 has the same meaning as the sentence 2?

**Sentence1.**

> 
> I wonder `how` you'd feel watching the longest continuous play recorded.
> 
> 
> 

**Sentence2.**

> 
> I wonder `how` you'd feel `about` watching the longest continuous play recorded.
> 
> 
> 

My second question:

What is the difference between these four sentences which are a kind of mixture of how, what and about.

**Sentence3.**

> 
> I wonder `what` you'd feel watching the longest continuous play recorded.
> 
> 
> 

**Sentence4.**

> 
> I wonder `what` you'd feel `about` watching the longest continuous play recorded.
> 
> 
>