Common mistakes
The root begins with و. In the present it drops out entirely: وَصَلَ becomes يَصِلُ, and the imperative is simply صِلْ.
يَوْزِنُ → يَزِنُ Present: heأَوْزِنُ → أَزِنُ Present: Iيَوْزِنُونَ → يَزِنُونَ Present: they (m.)تَوْزِنِينَ → تَزِنِينَ Present: you (f.)