3. Bibliography and webgraphy.
If you are interested in expanding this topic, you can consult the following bibliography.
- www.englishgrammaronline.com
- www.grammar.cl/Presentcontinuous.htm
- https://www.youtube.com/watch?v=uzx-mIErpbE
- https://www.youtube.com/watch?v=CkWCzB8dk2U
- https://www.youtube.com/watch?v=6rLQ5rphS7A
- Images taken from the web
