The phrase "before I submit" is correct and usable in written English.
It can be used when referring to actions or considerations that need to be addressed prior to submitting something, such as a document or assignment.
Example: "I want to double-check my work for any errors before I submit."
Alternatives: "prior to submission" or "before I turn it in".
"There'll be two or three more sleepless nights before I submit my list," he said.
I needn't be capable of translating 21 languages to impress admission officers, or wait until I've mastered the trombone and the nyatiti before I submit my applications.
He wrote: "Before I submit my name to Fifa and formalise my candidacy – if I do – and as your president it is my obligation and duty to seek your advice and opinion".
A talent manager also told Fox's "Pop Tarts" column, "I have to airbrush clients' to make them appear bigger and more womanly before I submit photographs.
It took several days of nagging before I submitted to my father's wishes.
Just before I submitted this post for publication, the petition had over 40,000 signatures.
(Before I submitted this article to the C.I.A.'s publications review board, I blacked it out myself to save the reviewers the trouble).
"I have no power to resist you, but had I been inside of my house, I would have killed one of you before I submitted to this illegal process," she said.
Eight months later, in February 2013 just a few weeks before I submitted my dissertation—I found myself flying in the opposite direction.
My immediate "supervisor" (a postdoctoral scientist working under my official supervisor) who had helped me all the way through my research project and taught me all the hands-on techniques painstakingly from scratch actually took the initiative to go through my whole thesis for grammatical errors and rewrote many portions of it for me before I submitted it to my actual supervisor for his review.
A good friend of mine, who is an English teacher, helped with the final proofreading of my manuscript before I submitted it to the publisher.
