![](https://elearn.ltes-global.com/pluginfile.php/155/course/overviewfiles/Prepositions.png)
Prepositions are words that show the relationship between a noun or a pronoun and another word in a sentence. They can indicate the position, direction, time, or manner of something. This course revisits some of the most common types with examples of use and practice activities.
![](https://elearn.ltes-global.com/pluginfile.php/239/course/overviewfiles/Countable%20Vs%20Uncountable%20nouns.png)
Understanding the difference between countable and uncountable nouns is crucial in English grammar.
![](https://elearn.ltes-global.com/pluginfile.php/93/course/overviewfiles/back%20to%20the%20roots%20Basic%20Tenses%20-%20The%20Past.png)
"Back to the Roots: Tense Review - The Past" focuses
on the "Simple Past", the "Past Continuous", the "Past Perfect", the "Past Perfect Continuous" and the "Past Future Continuous" tenses. In this
course, you will find short and clear explanations, practice activities
and more. Combine a revision of the Past tenses with vocabulary expansion!
![](https://elearn.ltes-global.com/pluginfile.php/37/course/overviewfiles/Back%20to%20the%20Roors%20Basic%20Tenses%20-%20The%20Present.png)
"Back to the Roots: Tense Review - The Present" focuses on the "Simple Present", the "Present Continuous", the "Present Perfect" and the "Present Perfect Continuous" tenses. In this course, you will find short and clear explanations, practice activities and more. Combine a revision of the Present tenses with vocabulary expansion!