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that (all) depends
The possibility of some outcome depends on one or more unspecified factors. A: "So, would you be willing to join our company?" B: "Well, that all depends—what kind of salary are we talking about?" Is it legal? Yes. Is it ethical? Well, that depends.
That (all) depends.
My answer depends on factors that have yet to be discussed. Tom: Will you be able to come to the meeting on Thursday night? Mary: That all depends. Bob: Can I see you again? Sally: That depends.