Questions & Answers about Sen gelene kadar burada duracağım.
Yes, it can often be omitted if the context already makes it clear who is coming.
- Sen gelene kadar burada duracağım = explicit you
- Gelene kadar burada duracağım = still possible, but now the listener must figure out from context who is meant
Using sen makes the subject of gelene kadar clear, and it can also add emphasis or contrast, like I’ll stay here until you come, not someone else.
Because sen is the subject of gelene kadar.
In this sentence:
- sen = the person who will come
- ben is understood as the subject of duracağım = I will stay
If you said seni, that would make you the object, which does not fit this structure.