1 Active voice- this is OK, but when we name the place, we tend to use 'left':
He forgot his bag.
He left his bag at home.
Passive voice- this is wrong- 'to school' is not the object so cannot be made into the subject
Gerund- This doesn't work- it's unnatural and a transformation that has no point to me. There should be a point behind transformations and I can't imagine anyone saying this- it has no real meaning.
- For Teachers