Kinds of prepositions:-

1.Simple-at,by,for,etc.

2.Compound-about,above,along.

3.Phrase-according to,in place of .

Relations Expressed by Prepositions

1.Place-Eg:He went around the world.

2. Time-Eg:- We left after his birth.

3. Manner-He fought with courage.

4.Reason-He did it for our good.

5.Measure-The bank charges interest at 6%.

6. Contrast-After every effort one may fail.

7.Inference-His skill comes from practice.