Difference between of and off.
There is a huge difference between of and off. Both of and off are prepositions, but they are miles apart in their usage and meaning.
1) Of is used to express possession (genitive form.)
Ex:1) A part of my heart died when she left me.
Ex:2) This is the property of my father.
2)Of is used to refer to origin or authorship.
Ex: This is the place of honest people.
3) Of is used to express measurement/quantity
Ex:1) A pound of flush and blood.
Ex:2) A big can of cola.
4) to state what something is made up of
Ex: A rod of iron.
5) to indicate direction
Ex: Darjeeling is in the east of Kolkata
6) of is used to denote what something contains
Ex: A box of candies
7)used as a function word to indicate the cause, motive, or reason
Ex: He died of cancer.
The word off is the opposite of the word on; away from.
-Take your jacket off the sofa ( opposite of ‘put your jacket on the sofa.’)
-Turn the fan off (opposite of turn the fan on.’)
–two miles off shore (off as away)
-Stay off her (stay away from her)