Which verb form best completes the sentence?

ellas al hermano de susana.
saben
conocen
conozcan
which verb form best completes the sentence?

ellas al hermano de susana.
saben
conocen
conozcan

Power going out story i need with a plot and the starting point is you wake up late, the power is out, and yeah. plz try to make it non complex since i have to write it in spanish if you want to go all out it needs to be in the preterit tense also know as past

Plz instructions fill in the blanks with either saber or conocer, or pedir or preguntar conjugate the verb to match the subject of the sentence. saber vs. conocer 1. ellos __ inglés 2. ¿ tú al professor alvarado ? 3. nosotros españa 4. ¿ ella quién es él pedir vs. preguntar 1. mi hermano ¿ qué hora es ? 2. nosotros

What is the difference between "conocer" and "saber"? use each verbs in a sentence in spanish.