prep bagging?

preposition is a word or group of words, such as in, at, from, to, out of and on behalf of, used before a noun or pronoun to show place,,position,method or time.
eg:-a country in China;
in the paper;
in an armchair;
in the 21st century
There are 31 days in May,Ha Ha !
in May
in the parking lot.
Pak Sun is parking in the sun !
"at" used to say where something happens;
at the airport
at the hospital
at the concert
at home
--Used to say when something happens:-
eg:-at dawn;
at the end of the week=at the weekend,
at 1 o'clock;
at the time of writing;
parking at Yale's carpark
"From" is used to show where somebody or something starts
eg:-keep something from somebody;
Pak Kin begins to walk away from the parking lots.
the train from TW arrives;
shop opens from 7 to 11 everyday.
the man from uncle;
a letter from my brother who was blinded from birth !
"to" prep. is used in the direction of something, towards something; walked to the carpark; on the way to the carpark;, to the station, to TW; fell to the ground;
Of-preposition:-is used for belonging to somebody; relating to somebody; a friend of mine; the love of the motor bike for Par Kin; the role of the supervisor;
On-preposition, is used for in or into a position covering, touching or forming part of a surface
eg:-Par Kin has been hit on the head;, on the table, on the carpark stone; the diagram on the wall, a blood mark on his shirt; Then she climbed on to the bed=then she climbed onto the bed.