Q) Fill in the blank with 'oldest' or 'eldest'.
1) John is the eldest of my uncle's five sons.
2) He is the oldest member of the school community.
3) That is Antonio, the duke's eldest son. (Is it right to start 'Duke' with small 'd'?)
4) The oldest mosque in the town is near the railway station.
5) Mr. Smith is the oldest teacher in the school.
You can use "oldest" in every one of those sentences and be just fine. The reverse is not true. "Duke" is capitalized only when it is part of a proper name.
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You can use "oldest" in every one of those sentences and be just fine. The reverse is not true.
"Duke" is capitalized only when it is part of a proper name. e.g.
Queen Mary went riding with the Duke of York.