A: I will try to...
B: Say what is you try!
I think it should be Say what is your try! Do native speakers say like that? Is it correct?
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No. It can be:
"what are you trying to..."
"what will you try (to)..."
Although the second sounds weird to me, it may be incorrect.
It can also be:
"what is it you're trying to..."
"what is it you try to..."
These are questions, I think they are more natural like this.
"Say, what is it you're trying to accomplish here?"
To get imperative you switch the positions of the pronoun and the verb. "you are", "you will" and "it is".