Sentence correction
1) I am going to hospital to see a friend who has undergone the operation
​2) What is difference between these cars 

I am going to the hospital to see a friend who has undergone an operation.
​What is the difference between these cars?

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sentence correction 
1)  I  am going to the hospital to see the friend who has undergone the operation .
2)  What is the difference between the cars ?
 
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