Usually, teachers are encouraged to provide meaningful feedback in addition to a grade so that students can receive guidance to improve their work. You can provide written feedback through private messages within the Assignment post, and comments within the submitted Google Docs document.
Private messages are the feedback for the entire assignment. They are similar to writing a couple of sentences at the end of an essay or a lab report. To add a private message, follow these instructions:
On the assignment page, click on the student's name in the Student list:
Below the list of attachments, click on the Add private comment... section:
Add your private message and then click on the POST button: