YOU SAID:
Hi my sister is annoying
INTO JAPANESE
こんにちは、私の妹は迷惑
BACK INTO ENGLISH
Hi, my sister is annoying
INTO JAPANESE
こんにちは、私の妹は迷惑です
BACK INTO ENGLISH
Hello, my sister is annoying
INTO JAPANESE
こんにちは、私の妹は迷惑です
BACK INTO ENGLISH
Hello, my sister is annoying
That didn't even make that much sense in English.