
Here you are, those sentences that were to be put into passive (or causative), using an infinitive construction where possible. Passive and causative structures are marked in bold.
- The money was added and [it was] found to be correct.
- I’m having the bathroom tiled.
- A terrible mistake seems to have been made.
- You are supposed to make tea.
- He is known to be armed.
- He was seen to pick up the gun.
- You are known to have been in town on the night of the crime.
- He is believed to have special knowledge which may be useful to the police.
- This needn’t have been done.
- You’d better have it taken in.
- He likes to be called ‘sir’.
- This switch is not to be touched / This switch mustn’t be touched.
- You’ll have to have it seen.
- This can’t be done.
- We are being followed.
- Boys used to be made to climb the chimneys to clean them.
- It has to be seen to be believed.
- I am tired of being ordered about.
- He doesn’t like to be laughed at.
- This watch needn’t to be wound.
- He shouldn’t have been told.
- They decided that the money should be divided.
- He is believed to have been killed [by terrorists].
- Letters are to be sent to the leaders of charitable organizations.
- She is considered to have been the best singer that Australia has ever produced.
- Smoking is not allowed.
- The expedition is known to have reached the South Pole in May.
- Before printing was invented, everything had to be written by hand.
- The government was urged to create more jobs / They urged that more jobs should be created.
- They suggested that the sale of alcohol should be banned.
Specific doubts may be consulted as comments to this post.