Thank you for an excellent article. I speak both Irish (Gaelic) and English as native languages, Irish does have the imperfect tense and English does not, so when I (or other Irish speakers) are speaking English we really miss having this tense in English. As a result Irish people speaking English have developed constructions in English to replace the imperfect tense, so we have phrases and ways of saying things which the English do not understand. But it is great to have an article like this that explains so clearly in what circumstances Spanish-speakers would use the imperfect. 
Muchas gracias.

I found this list very useful. However I find it a nuisance that these lessons are written in HTML. I like to download lists like this and print them out to study during  train journeys, or in the car while I'm waiting to collect someone. I had to open a word document copy it all into the document and then reformat the document, reducing the point size, cutting out all the unnecessary blank lines etc. It took quite a while. The document is now 5 pages long as opposed to over 20 pages when I first downloaded. 

I'm sure this is because of a policy decision by the web-site, but I would love if there were a downloadable Word version of each article.

I'm sorry if this sounds whingy. I find it's the same with every language site. I just hope you understand that I do appreciate the quality of this article and the effort that went into writing it.

Míle Buíochas (literally 'mil gracias') desde Irlanda.

Eoin

I find this article very good, but I wish it was in PDF format so I could download it, print it out and carry it with me. Any possibility?

Muchas Gracias

Eoin