preposition
1
BAD : We need to discover another source of income, beside oil.
GOOD : We need to discover another source of income, besides oil.
BAD : We went swimming in the river besides my house.
GOOD : We went swimming in the river beside my house.
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beside = next to: 'She walked over and sat down beside me.'
besides = in addition to; also: 'Who did you invite besides Tom and Mary?' 'Besides tennis, what other games do you play?' 'I'm too old to apply for the job. Besides, it would mean moving house.'
2
BAD : Beside of the traditional ceremonies, there are also foreign weddings.
GOOD : Besides the traditional ceremonies, there are also foreign weddings.
BAD : Besides of this problem, her husband had lost his job.
GOOD : Besides this problem, her husband had lost his job.
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When you mean 'in addition to', use besides (WITHOUT of ): 'Who did you speak to, besides Alice?' Beside/s of does not exist.
3
BAD : Beside the reduction of unemployment, the government has achieved very little.
GOOD : Apart from the reduction of unemployment, the government has achieved very little.
BAD : Besides the goalkeeper, who was a disaster, the team played very well.
GOOD : Apart from the goalkeeper, who was a disaster, the team played very well.
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When you want to say that someone or something is not included in your main statement, use apart from (NOT beside/s ): 'Apart from Peter, everyone had a good time.'