Continuous

When we want to describe an action happening at a particular time in the past, we use the past continuous tense (= прошло трајно време):

• We were watching TV at six o'clock.

The past continuous form is also used for two longer actions happening at the same time:

• Mum was washing the dishes while dad was reading the newspapers.

Finally, when we want to say that an action, usually a longer one, was interrupted by a new, shorter action, we use the past continuous form for the longer action and the past simple form for the shorter one:

• I was having a bath when the phone rang.

For more practice, go here, here, here, here, here or here.