a を極める！！

I want a job where I can create.

There's a cake in this box. 

             ∟輪郭・形・かたまりがはっきりするという意

There's a sandwich in my bag.

There are bits of sandwich in my bag.

　※bit：小片・細片・わずかの・一片の・一つの

Let's have dinner.

Let's have a dinner.

                 ∟ 特別感を出す

I had a lunch at ABC hotel yesterday. It was a great opportunity to meet people from various countries.

　※opportunity：機会、好機

英単語の語源図鑑 [ 清水　建二 ] 価格：1,650円（税込、送料無料) (2023/6/8時点) 楽天で購入