YOU SAID:

My mother bought me three yellow roses yesterday when she was out with her dinosaur.

INTO JAPANESE

母は昨日恐竜と一緒に出かけたときに黄色いバラを3本買ってくれました。

BACK INTO ENGLISH

My mother bought me three yellow roses when I went out with the dinosaurs yesterday.

INTO JAPANESE

昨日恐竜と出かけたとき、母が黄色いバラを３本買ってくれました。

BACK INTO ENGLISH

When I went out with a dinosaur yesterday, my mother bought me three yellow roses.

INTO JAPANESE

昨日恐竜と一緒に出かけたとき、母が黄色いバラを３本買ってくれました。

BACK INTO ENGLISH

When I went out with a dinosaur yesterday, my mother bought me three yellow roses.