Common mistakes
The root begins with و. In the present it drops out entirely: وَصَلَ becomes يَصِلُ, and the imperative is simply صِلْ.
يَوْقِفُ → يَقِفُ Present: heأَوْقِفُ → أَقِفُ Present: Iيَوْقِفُونَ → يَقِفُونَ Present: they (m.)تَوْقِفِينَ → تَقِفِينَ Present: you (f.)