English for Everyone
English for Everyone: Sentence Completion 1: Level 4 [Pdf]
English for Everyone provides a printable quiz to assess the recall of Level 4 descriptive vocabulary words.
Grammarly
Grammarly Blog: What Are Prepositions?
This page defines prepositions and provides examples.
Grammarly
Grammarly Blog: Uses of Prepositions
This page explains the uses of prepositions including to show direction, time, location, and spatial relationships. Examples are provided.
Grammarly
Grammarly Blog: Unnecessary Preposition
This page explains that changes in usage over time makes the use of prepostions in certain instances unnecessary. While they are not technically incorrect, they lead to wordiness and should not be used. Examples are provided.
Online Writing Lab at Purdue University
Purdue University Owl: Prepositions of Spatial Relationships
Maintained by the Purdue University Writing Lab, this tutorial has pictures to represent the various relationship among objects in a given space. Good for visual learners.
ACT360 Media
Writing Den Writing Tips: Sentence Builder: Prepositions
Grammar list of common prepositions that are linked to examples.