Curated OER
The Present & Imperfect Progressive
Starting off with present participles, this resource tackles the progressive with grammatical explanations, examples in English and Spanish, and an interactive practice exercise. Use the menu at the top of the webpage to navigate to each...
University College London
University College London: Survey of English Usage: Verbs Tense & Aspect
This site has information on the tense and aspect of verbs. Includes a short exercise to test your knowledge.