YOU SAID:
Ariel was looking for a book about mermaids
INTO JAPANESE
アリエルは人魚についての本を探していた
BACK INTO ENGLISH
Ariel was looking for a book about mermaid.
INTO JAPANESE
アリエルは人魚についての本を探していました。
BACK INTO ENGLISH
Ariel was looking for a book about mermaid.
That didn't even make that much sense in English.