That depends on what you're using the computers for.
Why do we use 前面 in this sentence. I thought 前面 was infront, why is there a location in a sentence involving use of something? Could someone break this down for me :)
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"That depends on what you do when you sit in front of (facing) a computer"
you have to sit in front of a computer's screen to operate it
The sentence '坐在电脑前面' doesn't describe the situation unambiguously.
Depend on context:
电脑前面 could refer to 'the front of a computer's screen' or 'the front of a computer's CPU'
坐在电脑前面 could mean you sit facing the computer operate it or sit with your back toward the computer, blocking everyone else's access to it.
Are you sure it wasn't "那得看你坐在电脑[面前]做什么"
A computer's screen is its face. '坐在电脑面前' means you are definitely facing its screen