1.The boy was seen to run yesterday.
2.I was told by him that he would come back soon.
3A lot of differences between the two languages can be found by you.
4 Are your flowers watered by you every day?
5The big tree was blown down by the wind last night.
ps:第3和第4句中的by you均可省,第5句中你应该是写错了吧?!应该是down而不是doen吧!