YOU SAID:
Yesterday a dinosaur ate a monkey
INTO JAPANESE
昨日恐竜が猿を食べた
BACK INTO ENGLISH
The dinosaur ate the monkey yesterday
INTO JAPANESE
昨日恐竜は猿を食べた
BACK INTO ENGLISH
yesterday the dinosaur ate a monkey
INTO JAPANESE
昨日、恐竜は猿を食べました
BACK INTO ENGLISH
yesterday the dinosaur ate a monkey
You've done this before, haven't you.