Online forms to support "grid" as exists in Google forms, and when done so to allow more than a single answer per row (Google does not)
Support Grid or matrix as a survey option and allow user to select more than a single answer within the matrix (grid as Google calls it). (Google does not support multiple answers). An example is dates as rows and class names, time of day, availability (yes/no), etc. as columns. When dates are recorded in the form and then the spreadsheet, allow the format to be in date format unlike Google where they are text.