Importing multiple user responses on a Form to a single row on a Sheet

I have a Google Form containing three linear scale questions. The form collects emails and then a value between 1 and 3 for each question. I need the people who respond to the form to do so biweekly. I would like to see their answers added as new columns in the same row as their first round of answers in the corresponding spreadsheet. I do not want to have a new row created for them each time they respond to the Form. I tried researching IMPORTRANGE but that didn’t work quite right. I assume I need to tell the sheet to look for matching emails but I’m not sure how to then add new columns with that email’s responses to the existing sheet.