prepositions

Prepositions are the words ,usually short ones ,that you can use to specify any particular relationship that exists between people or objects ,or between people and objects. Such a relationship can be temporary or permanent, physical or abstract . For example;
1 space [position and direction ]
She sat on this chair.
Glasgow is in Scotland
I walked towards the door.
First two example out of three are used to tell position but third example is telling direction.
Time;
1 I 'll see you at six o ' clock.
2My birthday is on 1 April.
3I sometimes go running before breakfast.
other relationships
Who is the girl with you.
The report was prepared by the marketing department.
Did you see that program about frogs
A PREPOSITION always has an  OBJECT .Its object is the noun , pronoun,or pronoun that follows .
Some animals are active only at night .
I usually travel to school by bus.
you need 200 grams of flour  for this recipe.
Please wait outside the door.
Turn to page 49.
We are moving house at the end of the week.
Look at that1.
Come with with me.
The bus left without him.
THE OBJECT OF A PREPOSITION CAB BE AN ing form [called a gerund or verbal noun.]
1I AM