YOU SAID:

I am astonished that Jacob had his camera on

INTO JAPANESE

ヤコブがカメラをつけていたのには驚いた

BACK INTO ENGLISH

I was surprised that Jacob was wearing a camera

INTO JAPANESE

ジェイコブがカメラをつけていてびっくりしました

BACK INTO ENGLISH

I was surprised that Jacob was wearing a camera