The imperative (فِعْلُ الأمْرِ ) is used for affirmative commands.
For many verbs, if the second letter of the second person jussive carries a vowel, the imperative is formed by deleting the first letter, as in the following example:
تَعَلَّمْ - تَتَعَلَّمْ (learn)
In many cases in which the second letter of the second person jussive carries a sukuun, the first letter is deleted and replaced with a vowel to form the imperative:
أُكْتُبْ - تَكْتُبْ (write)
See also: