in the morning
prep. phr..prep. phr.. The part of the day from when the sun rises until about noon.
prep. phr.. A prepositional phrase functioning as an adverbial of time, indicating the period between sunrise and noon.
I drink coffee in the morning.
She always goes for a run in the morning before she starts work.
Despite the previous night's late celebrations, he was surprisingly alert and productive in the morning, tackling the most difficult tasks first.
This phrase specifies that an action happens during the early part of the day.
Contrast with 'at night'; the preposition 'in' is used for 'the morning', 'the afternoon', and 'the evening', which is a common point of confusion.
I will call you on the morning.I will call you in the morning.The correct preposition for 'the morning' is 'in', not 'on' or 'at'.