The passé composé is a past tense that can be translated as the simple past or the present perfect. For the verb boire, it is formed with the auxiliary verb avoir and the past participle bu. J’ai bu pas mal hier soir. I drank quite a lot last night?

What is the imperfect tense of Vestirse?

The imperfect root of Vestirse is vestía. The imperfect tense is rarely irregular and can be easily conjugated from this form, which is the yo, and él/ella conjugation.

What is the stem change for dormir?

The verb dormir is a typical ‐ ir verb with an o>ue stem change. All forms will have regular endings and they will follow normal stem changing patterns.