A preposition is a word used to link nouns, pronouns, or phrases to other words within a sentence

good for your health.

That was good of you to come means you were begin nice and good to visit.

My little brother is good inside (his body) means even though you can’t see how he thinks and feels, he is good. Even if his behavior is bad.

The blueberry jam will be good on toast. 

Prepositions Exercises
The following exercises will help you gain greater understanding about how prepositions work. Choose the best answer to complete each sentence.
1. The bone was _______ the dog.
a. About
b. For
c. After
d. Considering
Answer: b. The bone was for the dog.
2. We are going on vacation _______ August.
a. On
b. At
c. In
d. Since
Answer: c. We are going on vacation in August.
3. Please put the vase ________ the table.
a. In
b. On
c. For
d. Over
Answer: b. Please put the vase on the table.
4. I received a present ________ Janet.
a. From
b. Of
c. By
d. About
Answer: a. I received a present from Janet.
5. School begins ________ Monday.
a. In
b. On
c. From
d. Since
Answer: b. School begins on Monday.
List of Prepositions
While there are only about 150 prepositions in the English language, these words are among the most important. Without them, the sentences we speak, read, and write would be difficult to understand. The following list of prepositions is not a complete one, however it is among the most comprehensive lists of prepositions available anywhere.