YOU SAID:

So yesterday I went to the supermarket to get a banana

INTO JAPANESE

だから昨日スーパーにバナナを買いに行った

BACK INTO ENGLISH

So I went to the supermarket yesterday to buy bananas.

INTO JAPANESE

というわけで、昨日スーパーにバナナを買いに行きました。

BACK INTO ENGLISH

So, yesterday I went to the supermarket to buy bananas.

INTO JAPANESE

というわけで、昨日スーパーにバナナを買いに行きました。

BACK INTO ENGLISH

So, yesterday I went to the supermarket to buy bananas.