Good lord, what happened to him?
He fell down the stairs.
Did you push him?
No, he managed to pull it off all by himself.
Is the 4. sentence correct and does it make sense?
Good lord, what happened to him? <<< Good lord is a bit old-fashioned now. I seldom hear it.
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Good lord, what happened to him? <<< Good lord is a bit old-fashioned now. I seldom hear it. You could say eg My *** . .
He fell down the stairs.
Did you push him?
No, he managed to pull it off all by himself. <<< This reply is correct grammar. It is also sarcastic.
Clive