b. Why do you use two prepositions "on in" in sentence b "replace the benches on in our campus"? By the way, you mea the last part of sentence b can be both "they're rotting" and "they're so rotten/decayed", right?
b. Why do you use two prepositions "on in" in sentence b "replace the benches on in our campus"? I made a careless mistake. I meant to cross out 'in'. Only 'on' is correct.
By the way, you mean the last part of sentence b can be both "they're rotting" and "they're so rotten/decayed", right?