A preposition is used to link nouns, pronouns and phrases to other words in a sentence. The word or phrase that the preposition introduces is called the object of the preposition. A preposition is used to indicate the temporal, spatial or logical relationship of its object to the rest of the sentence. Here are some examples of the prepositions “of” and “from”:

Preposition OF

Used to indicate belonging to something; relating to something:

• She is a friend of mine.
• She exemplifies the love of a mother for her children.
• Didn't you you but that new bike of Jimmy's.
• These are the inventions of Leonardo da Vince.

Used to indicate belonging to something; being part of something; relating to something:

• This is the front door of the house.
• He is the president of the company.
• He is a member of the football team.
• We now have the results of the election.

Used to indicate what somebody/something is, consists of, or contains:

• This is the city of London.
• It was a large crowd of people.
• The glass is full of milk.

Used to indicate measurents and expressions of time, age, etc.:

• Here are two pounds of flour.
• He received a pay raise of five percent.
• Today is the fourth of July.
• The year of his birth was 1999.
• She is twelve years of age.

Used to indicate somebody/something belongs to somebody/something:

• These are some of my friends.
• Here is one of the problems I have.
• This cat is one of our pets.
• He is the highest paid of all the athletes.
• She is twelve years of age.

Used to indicate position in space or time:

• I live just south of Atlanta.
• Hw was at Philidephia at the time of the revolution.
• We will be there at a quater of ten tonight.

Prepositions FROM

Used to indicate where someone or something starts:

• He walked away from the car.
• The bus from Los Angeles has arrived.
• We will walk from the start of the trail.
• The store is opem from ten to ten today.

Used to indicate who sent or gave something:

• I just got a letter from my uncle.
• The judge read the notice from the lawyer.
• The man from the insurance company gave a refund.

Used to indicate origin:

• Dorothy was from Kansas.
• This ia document from the French Revolution.
• That was a quotation from Shakespeare.

Used to indicate a reason:

• She felt tired from all the walking.