To shut down a computer in Engpsh, you can use the phrase "turn off the computer" or "power off the computer." Alternatively, you can say "shut down the computer" or "close down the computer." These phrases all mean the same thing: to turn off the power to the computer and close any open programs or processes.

Here are some examples of how you might use these phrases:

"Can you turn off the computer when you're finished with it?"
"I need to shut down the computer before I go to bed."
"I think it's time to power off the computer and take a break."
"I always close down the computer before I leave for the day."

Note that these phrases are used to describe the process of turning off a computer that is already running. If you want to turn on a computer that is turned off, you can use the phrase "turn on the computer" or "power on the computer."