From my blog:

Laysa/ليس, The Nominal Sentence Negator. It is used to negate a nominal sentence that does not contain a verb (see my article on the nominal sentence).

ليس Laysa is called “حرف مشبه بالفعل”, a particle resembling a verb, as it is “conjugated” like the verb TO BE, always in the past form.

You may already know how to conjugate the verb to be, كان kaana , in the past, but we will review it below.

Note how such a verb, containing a weak radical (a long vowel in the root, which makes it irregular) in the middle:

· is called معتل الوسط mu3tall alwaSaT, ill in the middle;· keeps the weak radical in the third person conjugation and loses it in the first and second person conjugation.

You are probably familiar with verbs of this category:

To say: قال، يقول

To live: عاش، يعيش

To return: عاد، يعود

To. sleep: نام، ينام

Laysa/ليس also has a long vowel in the middle and will also:

lose it in the first and second person conjugation,and keep it in the third person conjugation (see blue highlight)… EXCEPT in the feminine plural, third person (see pink highlight).

https://www.thouriabenferhat.com/

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