think this job is very important now because a lot of middle-aged people don't know how to use a computer or know how to use it very poorly. Correct or not?
correct :)
I know many things about computers that's why my friends often ask me for advices. Correct or not?
advice, because it's uncountable
On my opinion, it is very important to know how to use a computer. Correct or not?
In my opinion, ..
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