、。
You must submit the report by 5 tomorrow.
Literal
Tomorrow [possessive-の] 5-o'clock [until-までに], you [topic-は] report [object-を] submit must.
The polite-masculine pronoun 君 marks the addressee as a subordinate or peer. 提出する ('to submit') is standard for formal submissions of documents, reports, applications. ~なければいけない is the 'must' construction with slight obligation emphasis.