Up, down, in, out, left, right, forward, backward, or sideways are all examples of relative directions. The cardinal directions (north, south, east, and west) can also be used to represent direction. For example, north is the direction that most cities are located on, so saying I went north would mean that I went into a city. Directions such as these can be expressed using the prepositions in, up, down, etc. Direction can also be described as toward the north, toward the south, toward the east, or toward the west. These directional descriptions are often called compass points. There are also four imaginary directions that can be used in place of the words north, south, east, and west: above, below, behind, and ahead. They can only appear as part of certain phrases; for example, "to go upstairs" means to go into your house through the first floor window, but not through the second floor one because those are not upstairs from where you're standing. Now let's look at some sentences containing various types of directions. Here are some sentences with relative directions: I went east on Main Street and then south on Market Street. (east and then south) She turned west at the end of the street.