Google forms: Get two different type of answers to an answer

How can I get google forms to allow me to have two different type of answers to one question? Answers are to be related between them so when working results, I can get the grades of each group member.

QUESTION:

Please evaluate the performance of each of your group partners

ANSWER:

MemberName 1 ____ Grade: 0 to 20

MemberName 2 ____ Grade: 0 to 20

MemberName 3 ____ Grade: 0 to 20

Answers have to have the name of the partner and his evaluation/grade

A plus would be to have a previous question asking how many members the group has and, depending on the answer, display the correct number of fields to fill in

Thanks!

Alvaro