オンライン英語添削アイディー 
に提出した英作文が添削されて返ってきた。
Then, I tried to read it, but I couldn't clearly understand characters' backgrounds.
Then, I tried to read it, but I couldn't clearly understand the characters' backgrounds.
"characters"は「その本の」と限定されているのはわかる。
けれども、以前別の講師に初出の名詞は特定されていても"a/an"を付けると教わったので無冠詞（複数形なので）にした。
それでも間違えなのか。
難しいというか、冠詞の付け方がまったく分からない。
Only I could roughly understand was that they are introduced, and for some reason they seem to be destined to visit an island.
The only part I could roughly understand was that they are introduced, and for some reason they seem to be destined to visit an island.
"Only thing that I could roughly understand was.."と書こうと思っていた。
いずれにせよ"The"が必要。
That made me bored and quit reading it.
That made me bored and I quit reading it.
そっか、主語が違うから省けないか。
日本語なら「そこでつまらなくなって、読むのをやめた」と主語1個もなく言える。
