B1–B2
Own
Use 'own' after a possessive adjective to emphasise exclusive possession (my own room), independence (on my own), or personal belonging (a room of my own).
Own: Patterns and Common Errors
'Own' is a versatile emphasiser that always attaches to a possessive adjective. Learners at B1–B2 level frequently produce two errors: using 'an own' without any possessive adjective, and confusing 'by her own' with the correct idiom 'on her own'. These errors appear in learner corpora across multiple L1 backgrounds, suggesting they reflect universal gaps in instruction rather than L1 transfer alone.
Pattern 1: Possessive + own + noun (exclusive possession)
She has her own room. (= a room only for her — not shared)
I'd love to have my own flat one day.
They've always wanted their own garden.
I'd love to have my own flat one day.
They've always wanted their own garden.
Pattern 2: on + possessive + own (independence / alone)
He can do it on his own. (= without help, alone)
She travelled across Asia on her own.
Did you build that bookshelf on your own?
She travelled across Asia on her own.
Did you build that bookshelf on your own?
'On your own' is synonymous with 'by yourself'. The error 'by his own' blends the two constructions and is never correct.
Pattern 3: noun + of + possessive + own (personal belonging)
They dream of having a house of their own. (= a house that is truly theirs)
Common Mistakes
✗ He bought an own car. → ✓ He bought his own car.
✗ She did the project by her own. → ✓ She did the project on her own.
✗ She did the project by her own. → ✓ She did the project on her own.