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Relative adverbs for place, time, and reason.
Why you specifically
The rule
Relative adverbs introduce clauses after nouns for place, time, and reason. Use where for places, when for times, and why after reason. In formal English, where can often be replaced by in which or at which, when by on which or at which, and why by for which, but where/when/why are the most natural choices in everyday and IELTS writing.
The trap
This is the house when I grew up.
This is the house where I grew up.
Use where after a place noun to mean 'in which' or 'at which'.
I still remember the day where we met.
I still remember the day when we met.
Use when after a time noun to mean 'on which' or 'at which'.
Do you know the reason where she left early?
Do you know the reason why she left early?
Use why after reason to mean 'for which' or 'because of which'.
That is the café why we had lunch.
That is the café where we had lunch.
Where cannot replace when or why. It refers to a place.
Prove it
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