The source exercises ask for complete prohibitive conjugations of forms such as لَا يَجْتَنِبْ، لَا يَتْرُكْ، لَا يَمْنَعْ. Keep the appropriate imperfect stem and verb form, then apply the jussive rule to each person.
Word / formMeaning / explanation
يَجْتَنِبُ → لَا يَجْتَنِبْhe avoids → let him not avoid.
تَتْرُكِينَ → لَا تَتْرُكِيyou (woman) leave → do not leave.
تَمْنَعُونَ → لَا تَمْنَعُواyou (men) prevent → do not prevent.
Ijtināb belongs to a derived verb form with a different internal pattern, but the prohibitive jussive operation still applies.