The deadline for filing the Income Tax Return (ITR) for the financial year 2019-20 has passed. While direct filing is no longer possible, you may still be able to submit your return by applying for a condonation of delay. This process requires approval from the CIT under section 119(2)(b).
No, you cannot as date was already over on 31.3.21 but if you have to file then you can file return under condonation of delay u/s 119(2)(b) under approval from CIT