Theory on past tenses

We use past simple for (more than one correct option):

• actions which happened at a specific time in the past (when? -> last year)

• past habits (it's also a way to express them in addition to used to/ would)

• past actions which happened one after another in past

• past action which happened before a certain point in the past

• past action that won't take place again

Past continuous is formed in the following way: had + been + verb (with -ing ending)

• True

• False

Past continuous marks an action that was in progress at a certain time in the past.

• True

• False

If an action was in progress when another past action interrupted, we express the action in progress applying the following grammar tense:

• present continuous

• present perfect continuous

• past continuous

• future simple

Two or more simultaneous actions in the past are usually expressed by past continuous.

• True

• False

Past continuous time expressions (more than one correct option):

• while

• already

• since

• when

• all day/ night/ morning

Past perfect is formed in the following way:

• have/ has + 3rd form/ ed

• had + 3rd form/ ed

• am/ is/ are + ing

• will + be

An action finished before another action in the past or a certain time in the past is expressed by:

• Past continuous

• Past perfect continuous

• Past simple

• Past perfect

Past perfect continuous is used when we put emphasis on the duration of an action which started and finished before another action or stated time in the past. Usually for and ... are used with this tense.

If we want to express a habit that is no more existing, we use:

• be/ get used to

• used to/ would