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 -
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!
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