What is on used for? What is in used for? What is at for?

The year, quarter, month and week should be in, and the date and solar terms should be in;

At some point, at the age of table age;

It is natural to use it before Christmas, at night and before midnight.

In is often used in the morning, afternoon and evening, and fixed phrases are kept in mind.

(1)at mainly means:

At a specific time, such as … o'clock, 7 o'clock, 9: 30, etc.

② fixed phrases: at night, at noon, at that time, at the age of 10, at weekends, at Christmas, etc.

(2)on is used to mean "in ..."

③in is used to indicate:

(1) a year, a season, a month, a week, such as 2003, summer, September, the first 10 week, etc.

(2) after a period of time (within), such as a few days later, a minute later, two weeks later, etc.

③ Used before the nouns "morning/morning, afternoon, evening", such as:

Morning, afternoon and evening

If you mean the morning, afternoon and evening of a certain day, use the preposition on. Sunday morning, Saturday night

Coincidentally, it says: one day in the afternoon and one day in the evening, you can't use in, you can only use on

Prepositions in, on and at indicate places.

"Above", "near, adjacent to" the left and right sides of the contact surface;

In "inside" and "in the middle" can also mean "in a big place";

At stands for "small place", "entrance, station, theater";

There is a limited "crown" before home, so at must be replaced by in;

If "at night, traffic" is limited (certain), then "on the way home" is the first.

(1)on means "on" (contact with the surface of an object). For example:

His pen is on his desk.

It means "close; Bordering each other ",and on the left and right. For example:

North Korea is located in the northeast of China.

Tom sits on my right.

(2)in means "in" (inside an object) and "in the middle". For example:

My pen is in my pencil box.

In can also mean "in a big place". For example:

They live in Shanghai while we live in Beijing.

(3)at means that in a small place, AT is also used before nouns such as "entrance, station" and "theater". For example:

In front of the library, at the bus stop, at the theatre, at the cinema.

(4) at is usually used before (4)home, but if there are attributives such as possessive pronouns or definite articles, you must use in. For example:

At home, in my home, in his simple home (in his simple home)

(5) If the nouns "night" and "bus, bicycle, train, etc." There is a qualifier in front of it, and the preposition "on the road" is used. For example:

1 He was at home in the evening of May.

Jim often goes to school by bike.

On the way home, Li Hua found a wallet.