on which day he is happy vs on which day is he happy

Both phrases are correct, but they are used in different contexts. "On which day he is happy" is more commonly used in informal speech, while "On which day is he happy" is more formal and follows the standard subject-verb order in English questions.

Last updated: March 29, 2024

on which day he is happy

This phrase is correct in informal speech.

This phrase is commonly used in informal contexts when asking about the specific day someone is happy.

Examples:

I wonder on which day he is happy. Maybe it's on Fridays.
Tell me on which day he is happy so I can plan a surprise.
Do you know on which day he is happy?

Alternatives:

I wonder which day he is happy on.
I wonder which day makes him happy.
I wonder on which day he feels happy.
I wonder which day brings him happiness.
I wonder which day he finds happiness on.

on which day is he happy

This phrase is correct and follows the standard subject-verb order in English questions.

This phrase is more formal and is commonly used in written English or formal speech when asking about the specific day someone is happy.

Examples:

On which day is he happy? I need to know for the schedule.
Can you tell me on which day is he happy?
I wonder on which day is he happy.

Alternatives:

On which day does he feel happy?
On which day does he find happiness?
On which day does he experience happiness?
On which day does he enjoy happiness?
On which day does he show happiness?

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on which day he is happy vs on which day is he happy