YOU SAID:
that girl is so annoying
INTO JAPANESE
その女の子はとても迷惑です
BACK INTO ENGLISH
The girl is very annoying.
INTO JAPANESE
女の子は非常に迷惑です.
BACK INTO ENGLISH
The girls are very annoying.
INTO JAPANESE
女の子は非常に迷惑です.
BACK INTO ENGLISH
The girls are very annoying.
That didn't even make that much sense in English.