The Hamzah in the imperative أَكْرِمْ is Hamzat-ul-Qat', not Hamzat-ul-Wasl.
The lesson also states that this Hamzah is not visible in the active and passive Mudhaari' forms:
1. يُكْرِمُ.
2. يُكْرَمُ.
So do not write the imperative as اِكْرِمْ in this paradigm.
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The Important Hamzah Rule
Derived Trilateral (without Hamzah) - Bab 1: If'aal (Ikram)
The Hamzah in the imperative أَكْرِمْ is Hamzat-ul-Qat', not Hamzat-ul-Wasl.
The lesson also states that this Hamzah is not visible in the active and passive Mudhaari' forms:
1. يُكْرِمُ.
2. يُكْرَمُ.
So do not write the imperative as اِكْرِمْ in this paradigm.