How can I combine answers from all of my questions into one field inside of PDF report?

Is there a way to combine all answers to question 1 together, question 2 together, etc. in a pdf?

If I understood you correctly you want to combine answers from all of your questions into one field inside of PDF report.

If that is the case you can add one additional field inside of your form and use conditional logic "Update a form field value". More about this conditional logic you can find in this article:

https://www.jotform.com/help/286-How-to-Populate-Field-with-a-Value-from-another-Field 

Than with "Update a form field value" conditional logic you can pass values form all other fields from your form to your new field. And when you create PDF report all data will be shown inside of that new added field.

Here is my demo form: http://form.jotformpro.com/form/52355815702959? 

You can also hide that additional fields so it won't be visible inside of your form. 

Feel free to clone my form.

Hope this will help. Let us know if you need further assistance.