Verb Endings after an, lan, kay and Prohibitive lā

After certain particles the present-tense verb changes its mood. In unvowelled writing you can see this on the five verbs: the forms ending in -ūna, -īna, -āni lose their final ن.

• After أن (that, to), لن (will not), كي (so that) and حتى (until, so that) the verb is subjunctive: تذهبون → أن تذهبوا, تدرسين → أن تدرسي, يسافران → لن يسافرا.
• The prohibitive لا (don't!) takes the jussive, which looks the same in these forms: لا تتأخروا (don't be late, pl.), لا تغضبي (don't be angry, f.), لا تلعبا (don't play, you two).

The masculine plural gets a silent ا after the و: يتعلمون → يتعلموا. In regular verbs the forms for أنا, أنتَ, هو, هي and نحن only change their final short vowel, which is not written, and the feminine plural in ـن (يذهبن) never changes.