Please check my answers prepositions please check plz????????

Dear Student,

Your question seems to be incorrect. But assuming your question to be < Please check my answers Active Passive>; here is the answer accordingly:

All sentences are correct except the following:

18) A bus knocked down the child.

20) She is being watched by me very carefully.

21) Our dinner was had in time. (Though this sounds odd, it is changed like this only) 

If this was not what you had in mind, please re-post the clear & correct query in a new thread, & our experts would be happy to help you there.

Regards