A preposition is a word that shows the relationship between two objects, things, persons, or conditions.
Preposition should be used properly. Change in position of preposition results in change of relationship.
To use preposition correctly, some rules should be followed.
1. Do not use the preposition ‘to' after tell, show or promise.
2. If you use a person after the words describe, explain, complain, say, shout, speak, suggest, talk, you should use the preposition ‘to' after these words. However, the preposition ‘to' need not be used after the words ask, advise, invite, encourage, remind, even you use the person addressed after these words.
3. There are some prepositions which look similar but should be used in different cases.
i. Besides and beside are totally different. ‘Besides' means in addition to. ‘Beside' means at the side of.
ii. Between and among. ‘Between' is used for two people or things. On the other hand ‘among' is used for more than two people or things.
Eg1. I promised to him. (Incorrect)
I promised him. (Correct)
Eg2. I described him the purpose of this project. (Incorrect)
I described to him the purpose of this project. (Correct)