There (are) many trees (on the right) of the street.
There (are) many trees (on the left) of the street.
There (are) many trees (on the right side) of the street.
There (are) many trees (on the left side) of the street.
There (are) many trees (on both sides) of the street.
are
on
both
sides
on the right
on the left
on the right side
on the left side
on both sides