Google-forms – I was sent a google form (link) and can see the senders answers

There are different ways you can view a document made in Google Apps

1. docs.google.com/spreadsheet/pub
2. docs.google.com/a/domain.com/spreadsheet/viewform?formkey=FORMID
3. docs.google.com/spreadsheet/viewform?formkey=FORMID
4. Embed on domain of application

Where 2 redirects to 3. Option 1 is most likely what you want users to see.

Option 1 is found via File > Publish to Web. Here you should see the choice to let users sign in with their domain.com account. This is greyed out but we will deal with this a little later on Thus if I am no signed with a domain.com I will get the request page. You will need to go to Form > Edit Form and change the sign-in option to view the form (not the spreadsheet). Now depending on your visibility settings you may get a pop-up asking whether the form should be seen outside of domain.com.

If you wanted Option 4, don't deselect this option. You will need to get this on the domain itself so for example domain.com/form.html. Using a Google sites for example https://sites.google.com/a/domain.com/test/ to handle the form will not work.

If you selected the uncheck the sign-in to view form, Option 3 should now work.

To get Option 1 working the admin of the Apps account needs to go in the Dashboard settings and manually enable it. Note changes will take a while to propagate, be patient with this change in the dashboard

If you were given the link but do not own the form, then no - responses are private unless the response spreadsheet is shared with you.

If the response spreadsheet was shared with you however, then you can just search for that document title in your Drive list, and it will appear as a normal shared document.

No idea how Drive generates document keys, but they are different between the spreadsheet and the actual form, again to make sure that the responses are private unless explicitly shared with others.