Give a few examples of when you would use the imperfect tense?

In Spanish the imperfect tense is used for:

1. describing how things/people were in the past:

e.g hacía calor =it was hot

       era cansada = I was tired 

2. To describe a regular action that used to happen in the past 

e.g. cuando era más joven, jugaba al tenís cada semana = when I was younger, I used to play tennis every week 

3. To decribe actions that were in progress in the past

e.g. Me caí cuando cruzaba la carretera = I fell over whilst I was crossing the road