YOU SAID:

I was just sitting there under the cherry tree when all of a sudden a plane came crashing down and hit my knee.

INTO JAPANESE

ちょうど桜の木の下に座っていたら、突然飛行機が墜落して膝にぶつかりました。

BACK INTO ENGLISH

I was just sitting under a cherry blossom tree when suddenly the plane crashed and hit my knees.

INTO JAPANESE

ちょうど桜の木の下に座っていたとき、突然飛行機が墜落し、私の膝にぶつかりました。

BACK INTO ENGLISH

I was just sitting under a cherry blossom tree when suddenly the plane crashed and hit my knee.

INTO JAPANESE

ちょうど桜の木の下に座っていたとき、突然飛行機が墜落し、私の膝にぶつかりました。

BACK INTO ENGLISH

I was just sitting under a cherry blossom tree when suddenly the plane crashed and hit my knee.