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Common Errors

   
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  Bad
  Bad at
  The use of the preposition in in the first sentence is wrong. It should be replaced with at.
Incorrect The boy is bad in Mathematics.
Correct The boy is bad at Mathematics.
 
  Worse at, Worst at
  Similarly, the use of in for the comparative and the superlative of bad (worse and worst) is also wrong.
Incorrect The boy's brother is worse in Mathematics.
Incorrect His friend is the worst in Mathematics.
Correct The boy's brother is worse at Mathematics.
Correct His friend is the worst at Mathematics.
   
  Excel
  Excel at ( an activity )
  According to English Prepositional Idioms by Frederick T. Wood, for being extremely good at an activity, excel in may be used but excel at is more common
Incorrect This artist excels in painting birds.
Correct This artist excels at painting birds.
   
  Excel in ( an attribute or quality )
  According to the same source, the use of the preposition at is not appropriate when we use excel for qualities or attributes.
Incorrect She excels at intelligence.
Incorrect My brother excels at foreign languages.
Correct She excels in intelligence.
Correct My brother excels in foreign languages.
 
  Good
  Good at
  The use of the preposition in in the first sentence is wrong. The correct preposition to use is at.
Incorrect He is good in Mathematics.
Correct He is good at Mathematics.
 
  Better at, Best at
  The use of the preposition in for the comparative and the superlative of good (better and best) in the two sentences is wrong.
Incorrect He is better in Mathematics.
Incorrect He is the best in Mathematics
Correct He is better at Mathematics.
Correct He is the best at Mathematics
 
 
 
 

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