Shut down the computer We should say : I will shut down the computer when you disconnect it. Some people say 'switch off the computer which is incorrect.
On/Off: These words are used with electrical appliances. For example: Please switch on the fan. Switch off the light.
Put off the fire: To stop the fire from burning we,should say- Please put off the fire.
Get off the bus: To alight from the bus or train.
I shut down the computer after sending an E-mail to my friend.
Rani was trying to burn some waste paper. She put it off, when the flames increased suddenly.
Raj got off the bus when it stopped at the signal.