haven't and didn't

[eddy143]

greetings to you all.
i was ponder on these two sentences and still haven't gotten the right answer yet. please help me out if u can.
1-my postcard is still on the desk. why haven't you posted it?
2-my postcard is still on the desk. why didn't you post it?


thanks.

[freezeframe]

greetings to you all.
i was ponder on these two sentences and still haven't gotten the right answer yet. please help me out if u can.
1-my postcard is still on the desk. why haven't you posted it?
2-my postcard is still on the desk. why didn't you post it?


thanks.

1-my postcard is still on the desk. why haven't you posted it yet/by now?
2-my postcard is still on the desk. why didn't you post it when* I told you to?

*when here refers to a time in the past