"请开门。"

Translation: Please open the door.

[Andrew-Lin]

請開門。
Fun fact: In traditional Chinese, both open "開"(simp. 开) and close "關"(simp. 关) consist of a door "門(simp. 门)". That's how the characters are created.

[ToEach_TheirOwn]

I really wish duo would work on their hints for Mandarin. Saying that this means "please open" isn't really helpful the first time you're learning the word for "door"...

[Dan703524]

"Please open the gate" should also be acceptable

[Celticfiddleguy]

I'm pretty sure this could also be plural: "Please open the doors".

[_LolZ_]

Can "Please open up" be accepted?

[weewoo9]

Well im surprise that dont allow please open door

[TaylorGrayMoore]

That wouldnt really be a grammatical sentence in English