YOU SAID:
Yesterday was my birthday and we watched carrots
INTO JAPANESE
昨日は私の誕生日で、ニンジンを見ました
BACK INTO ENGLISH
Yesterday I saw a carrot on my birthday
INTO JAPANESE
昨日私は私の誕生日にニンジンを見ました
BACK INTO ENGLISH
Yesterday I saw a carrot on my birthday
That didn't even make that much sense in English.