You have not sent the parcel.

1. The parcel has not been sent by you.
2. The parcel had not been sent by you.
3. The parcel is not being sent by you.
4. The parcel was not being sent by you.

Present perfect passive negative correctly transforms “You have not sent” to “The parcel has not been sent by you.” Structure: object (parcel) becomes subject + has + not + been + past participle (sent). The negative “not” stays after auxiliary “has.” This form emphasizes that the parcel remains unsent at present, focusing on the parcel’s status rather than the sender’s action.