'Work' + 'IN' (Field or Sector)
"I work 'IN' finance."
"I work 'IN' the HR Department."
'Work' + 'AT' (Place)
"I work 'AT' a hospital."
'Work' + 'FOR' (Person)
"I work 'FOR' Mr.Beast."
'Work' + 'AT'/'FOR' (Company)
"I work 'AT'/'FOR' Apple." (Any of them)
'Work' + 'AS' - (Job or Position)
"I work 'AS' a teacher."
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English Grammar Tips (I)
Non-FictionGrammar, vocabulary, interviews. Everything you can imagine, ...