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Could explain to me if these senteces are correct or if I have to use these verbs in a different way?
1) Sorry, but I have to sign the computer off.
2) Sorry but I gave to shut the computer down.
3) I have nothing to do. Let's boot the webcam up and let's start chatting.
4) I wanna start the pc and play in peace.
COuld you write some senteces where with these 4 verbs used correctly?
1) Sorry, but I have to sign off (of the computer) now.
2) Sorry, but I have to shut (down) the computer (down).
3) I have nothing to do, so let's turn on the webcam and start chatting.
4) I want to start/boot the PC and play in peace.
shut down; sign off; boot up; start 
Linear Mode
