Personal Pronouns are not compulsory. Verbs are self-sufficient. Look attentively at the models above. If UKAN is an auxiliary verb it does not take the BA- .
Vous tes jeunes et je suis vieux.
Ces deux premi res le ons sont essentielles. R visez-les avant de passer aux suivantes. These first two lessons are essential. Do revise them before going to next lessons.