"Jelaskan apa yang sudah kamu lakukan."

Translation: Explain what you have already done.

[donny309620]

The word "sudah" implies a different form of past tense, hence "Explain what you have done" is more reflective of the meaning in the Indonesian sentence.

[MissPondihehe]

I agree, Explain what have you done should be enough.

[MingWei567]

Why is it not "Explain what you have already done."

[Diponegoro57]

That is fine and is accepted.