- I messaged you in the morning.
- I messaged you in morning.
I am confused which sentence is correct. I think both are correct, but please help me out and tell me which sentence is grammatically correct.
Morning needs an article, so your example
I messaged you in the morning.
But since this is past tense, it would be better to write:
I messaged you this morning.
For the future it is OK though:
I will message you in the morning.
user3169's answer is very good.
If you heard "in morning" as an expression (i.e. without the article) it's more likely to be in the context of "He/she is in mourning." This meaning is that the person is grieving over (typically) the death of a friend/relative. Clearly a very different meaning.