I don't agree with Ahmed at all here. It is correct to say 'I use a computer' and incorrect to say 'I use computer'. I would also use 'the' in the last example. When we are thinking of the individual machines, the noun is countable, so the singular requires a determiner. When we are thinking of the concept, it is uncountable, but generally takes the definite article, as in 'The computer is very useful'. With the 'disadvantage of a computer', I would be tempted to use 'the' as I am thinking about computing in general. |