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 • 856 views

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?

Show examples from the web [+]

These last days he was so happy and at peace with the world.
Never saw such a lovely day Happy Easter
If it's really true, I will day happy.
It is your responsibility to make her final days happy ones.
Happy happy Lily day! Happy happy Lily day...
Quite possibly my last happy day.
Happy days, boys, happy days. Edgar Caldwell from campaign headquarters.
I only use personal days for happy occasions.
Every dog has his day, Happy.
Happy Labor Day weekend, union supporters.
Our last days together weren't happy.
She was so happy that day.
For that happy day Happy day.
A kind of Buddhist gene that makes my happy days not so happy and my sad days not so sad.
We can't just sit around here all day playing Happy Families.
It's a good day, a happy day.
Let us go and enjoy the blessings this happy day brings us.
Coming up will be Happy Days' Erin Moran and Princess Elinor Donahue...
Happy day on which our glorious father has returned!
More happy days bring in another moon.

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.

Show examples from the web [+]

Ordinarily, game day is a happy occasion.
Ordinarily, game day is a happy occasion.
I'm so happy this day is finally here.
BERKELEY - The US Federal Reserve these days is broadly happy with its monetary policy. But, since mid-2007, its policy has been insufficiently expansionary.
Never saw such a lovely day Happy Easter
If it's really true, I will day happy.
It is your responsibility to make her final days happy ones.
You, my... Son. I'm so happy this day is finally here.
Happy happy Lily day! Happy happy Lily day...
Quite possibly my last happy day.
Happy days, boys, happy days. Edgar Caldwell from campaign headquarters.
I only use personal days for happy occasions.
Every dog has his day, Happy.
Happy Labor Day weekend, union supporters.
Our last days together weren't happy.
She was so happy that day.
For that happy day Happy day.
A kind of Buddhist gene that makes my happy days not so happy and my sad days not so sad.
We can't just sit around here all day playing Happy Families.
It's a good day, a happy day.

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