Dependent Form Fields

[#1]

My Hubspot Does Not Appear "Dependent Form Fields"

The reason would be for being free?

[#2]

Correct.  Many of the advanced logic features require a paid subscription.

[#3]

That's right.  The dependant field feature is available only in the paid version. 
Do you have a CSS developer? You can make form fields appear based on the input value of some fields using CSS and javascript. 

Thank you.  
-AM