Bibliography
- https://www.idiomasgratis.com/ig_view_resource.php?html_code=ig_basico_c2_a4_p1.html
- https://www.curso-ingles.com/gramatica-inglesa/preposic.php
- https://www.shertonenglish.com
- https://poemaseningles.blogspot.com/
- https://www.mansioningles.com/
- https://conjugador.reverso.net/conjugacion-verbos-irregulares-ingles.html#s
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