1999 Volkswagen Jetta Q&A

1999 Volkswagen Jetta Question: How to tell if the engine needs to be rebuilt

I was driving my car and it just killed after getting it to the house I could see water leaking out from underneath the car the car wont crank,So I just recently had a mechanic to look at it he says its the engine.I dont know much of anything about cars so my question is how can I be sure that its really my engine could you determine that even without the car cranked? -
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