YOU SAID:
Elizabeth needs to tell me what she didn't yesterday
INTO JAPANESE
エリザベスは昨日何をしなかったか私に話す必要がある
BACK INTO ENGLISH
Elizabeth needs to tell me what she didn't do yesterday.
INTO JAPANESE
エリザベスは昨日何をしなかったことを私に話す必要があります。
BACK INTO ENGLISH
Elizabeth must tell me what she did yesterday.
INTO JAPANESE
エリザベスは昨日何をしたか私に話さなければならない。
BACK INTO ENGLISH
Elizabeth must tell me what she did yesterday.
That didn't even make that much sense in English.