should "στειλε το βιβλιο " also be accepted? Or is this more of a command: Send the book!
Yes, στείλε is the imperative form, so it is "Send the book!"
What is the difference between στέλνεις and αποστέλλεις?
Why is Στελνετε το βιβλιο not accepted?
It is added now. Thanks