Welsh/Grammar/Verbs/Imperfect

The imperfect tense in Welsh can translate as the following. For example, Roeddwn i'n gweithio can translate as 'I was working' or 'I used to work'. Note there is a material difference between 'I worked' and 'I was working': in the first phrase, the action has been completed in the past (preterite or past perfective tense), whereas in the second, the action is continuous, yet still in the past (hence, imperfect or past imperfective tense).

Roeddet ti'n nofio ddoe.
 * You were swimming yesterday

Roedd hi'n caru Sarah.
 * She was loving Sarah.

Roedden nhw'n sefyll tu allan y dafarn.
 * They were standing outside the pub.

Roedd y bocs yn las.
 * The box was blue.

Roeddwn i'n feddyg.
 * I was a doctor.

Doeddet ti ddim yn nofio ddoe.
 * You weren't swimming yesterday

Doedd hi ddim yn caru Sarah.
 * She wasn't loving Sarah.

Doedden nhw ddim yn sefyll tu allan y dafarn.
 * They weren't standing outside the pub.

Doedd y bocs ddim yn las.
 * The box wasn't blue.

Doeddwn i ddim yn feddyg.
 * I wasn't a doctor.