Google Forms / Getting started with Google Forms 

Track individual form responses

As well as emailing your form to specific people, you can track who has responded to your form and who has yet to complete it. You can also send reminder emails to people that haven't yet completed a form, to remind them to do so as soon as possible.

Before tracking who has responded to a form, the form must be set to only allow responses from your organisation, and only one response per person:

You can now send the form via email to the people you wish to track:

Now, when you click on the Responses tab of the form, you will be able to see exactly who has responded and who hasn't:

Click on the Send Email Reminder link to send an email to everyone that hasn't responded to the form: