Active to passive voice:
Someone seems to have made a terrible mistake.
=>........................................................................
He recommends fitting new tires.
=>________________________
He suggested allowing tetants to buy their houses.
=>_____________________________________
It is your duty to make tea at eleven o'clock.
=>_______________________________
Someone has seen him pick up the gun.
=>_____________________________
Don't touch this switch.
=>________________
Don't speak until someone speaks to you.
=>______________________________
Before they invited printing people had to write everything by hand.
=>____________________________________________________
Someone seems to have made a terrible mistake.
=>...................Someone seems to have made a terrible mistake......................................................
He recommends fitting new tires.
=>__________He recommends new tyres should be fitted.______________
He suggested allowing tetants to buy their houses.
=>________He suggested allowing council tenants to buy their houses_____________________________
It is your duty to make tea at eleven o'clock.
=>__________It is your duty to make tea at 11 o’clock._____________________
Someone has seen him pick up the gun.
=>___________ He was seen to pick up the gun__________________
Don't touch this switch.
=>_______This switch is told not to be touched_________
Don't speak until someone speaks to you.
=>_________.Don't speak until you are spoken to. _____________________
Active to passive voice:
Someone seems to have made a terrible mistake.
=>..............A terrible mistake seems to have made................................................
He recommends fitting new tires.
=>_____He recommends new tyres should be fitted.___________________
He suggested allowing tetants to buy their houses.
=>____He suggested that council tenants should be allowed to buy their houses._________________________________
It is your duty to make tea at eleven o'clock.
=>______ You are supposed to make tea at 11 o'clock._________________________
Someone has seen him pick up the gun.
=>______he was seen to have pick up the gun_______________________
Don't touch this switch.
=>____ Don't let this switch be touched.____________
Someone seems to have made a terrible mistake.
=>....A terrible mistake seems to have been made............
He recommends fitting new tires.
=>__He recommends new tires should be fitted____
He suggested allowing tetants to buy their houses.
=>__He suggested tenants should be allowed to buy their houses____
It is your duty to make tea at eleven o'clock.
=>___You are supposed to make tea at eleven o'clock_____
Someone has seen him pick up the gun.
=>__He has been seen to pick up gun_____
Don't touch this switch.
=>__This switch must not be touched____
Don't speak until someone speaks to you.
=>___Don't speak until you are spoken to___
Before they invited printing people had to write everything by hand.
=>__Before printing was invented, everything had to be written by hand ___