0

I do not know where did it fall

Or

I don't know where it fell.

Or

I don't know where has it fallen

Or

I don't know where it has fallen.

Which one is right or appropriate?

1
  • Of the two additional sentences you've added in your edit, "I don't know where it has fallen" is ok but not "I don't know where has it fallen".
    – Karasinsky
    Jul 12 '15 at 19:55
4

I do not know where did it fall

is not correct, familiar or idiomatic in any written or spoken variety of English that I've come across.

I don't know where it fell

is fine and normal.

1
  • Edited the question with more queries Jul 12 '15 at 2:00

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