Hello Cécile, with this lesson on imparfait, I still do not understand. I am still struggling with this little phrase 'se'

Hi Fiona, 

If I have understood your question correctly the part you are struggling with is the extra pronoun 'se' which are pertinent to reflexive verbs ...

Take a look at the following lesson on reflexive verbs in the present tense -

https://french.kwiziq.com/revision/grammar/conjugate-reflexive-verb-se-lever-in-le-present-present-tense

This should show you how the additional 'se' figures with the following pronouns, il/elle/on/ils/elles .

Then you should be able to tackle reflexive verbs using the imperfect.

Hope this helps!