Why are teachers against (to be against = to mind = быть против) using mobile phones at school?
Teachers are against using mobile phones at school because phones distract (отвлекать)you.
Where do you usually switch off your phone?
I usually switch off my phone at school and on the plane.
How can you use mobile phones to learn foreign languages?
I would use mobile phones for translating words. It is easier than using a dictionary. I can also talk to (practice my English with) Americans on the Internet.
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