Prepositions tell us how words in a sentence interact with each other. Some prepositions tell us where or when something happened.

• They were meeting at midnight.

The preposition "at" tells you when something will happen.

There are four types of prepositions.

Direction Prepositions

Direction prepositions tell you where something is happening.

• Look in the box to find your present.

Time Prepositions

Time prepositions tell when something is happening.

• She will be working until 5 o'clock.

Location Prepositions

Location prepositions tell you where something is happening.

• He is at school.

Space Prepositions

Space prepositions indicate a spatial relationship between words in your sentence.

• The boy hid under his bed.