To express prohibition (النهي) in Arabic, we use the particle (لا) with the present tense form of the verb conjugated with you. In this post, I explain how to make orders with (أنتَ) you singular masculine.
Consider the following examples:
أنتَ تفتح.
You open.
لا تفتحْ.
Don’t open!
أنتَ تستمع.
You listen.
لا تستمعْ.
Don’t listen!
أنتَ تحمل.
You carry.
لا تحمل ْ.
Don’t carry!
It should be noted that when (لا) is used for prohibition before a present tense verb, it becomes in the jussive case (المجزوم), i.e. it ends in (سكون) like the examples.