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1. This is the hospital where I was born.
2. This is the hospital I was born.
3. This is the hospital I was born in.

Are they all grammatical?
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Michelle ChaAre they all grammatical?
No. Number 2 is not grammatical.

CJ
Comments  
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3. This is the hospital I was born in.

It can be like this "I was born in this hospital"