B1 Questions & Negation 7 min read 简单

使用 Laysa (ليس) 否定句子：'不是'

想表达“不是”时，就用 ليس。记得根据人称变位，并给后面的描述词加上 -an 这种“宾格”小尾巴。
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Grammar Rule in 30 Seconds

Use 'Laysa' (ليس) to negate nominal sentences (sentences without a main verb) by conjugating it to match the subject.

  • Laysa changes its ending to match the person: 'Lastu' (I am not), 'Laysa' (He is not).
  • It is used for present tense negation of states or identities, not actions.
  • The predicate (the thing you are not) usually takes the accusative case (fat-ha).
Subject (optional) + Laysa (conjugated) + Predicate (in accusative)

Overview

Ever tried to tell a delivery driver ليس هذا طلبي (This is not my order) only to realize you don’t know how to conjugate 'is not'?
Or maybe you're scrolling through TikTok and want to comment هذا ليس مضحكاً (This isn't funny) but the grammar feels like a final boss battle?
Arabic has a specific way of saying no to descriptions, and ليس is your best friend for these moments.
It’s the grumpy cat of Arabic grammar—it exists solely to deny things.
Unlike English where you just add not, Arabic uses a special word that acts like a verb but behaves like a vibe.
Let’s get you ready to say no like a pro, whether you're dodging an awkward Zoom invite or correcting a Google Translate fail.
Nominal sentences in Arabic (sentences starting with a noun) are simple: الجو جميل (The weather is beautiful).
But what if the weather is actually terrible and your beach plans are ruined?
You need ليس. This word is technically a verb, but it’s a bit of a rebel.
It only exists in the past tense form, even though it describes the present.
Linguists call it a فعل جامد (frozen verb) because it doesn't have a future or a command form.
You’ll never say will not be using just ليس.
Its main job is to negate the مبتدأ (subject) and خبر (predicate) relationship.
Think of it as the filter that turns a positive statement into a negative one.
It’s like clicking the 'dislike' button on a post—it changes the whole energy of the sentence.
If someone says أنت طالب (You are a student), and you've already graduated, you'd shout لستُ طالباً (I am not a student).
It’s precise, it’s punchy, and it’s essential for B1 learners to master.
Just don't use it to negate actions (verbs)—that's a job for other particles like لا or ما.

How This Grammar Works

In Arabic, ليس belongs to a group called كان وأخواتها (Kana and its sisters).
These sisters are grammar influencers—they walk into a sentence and change everyone's style.
Normally, a nominal sentence has two parts that both end in a Dhamma (u sound).
When ليس enters the room, the subject stays the same, but the predicate (the description) gets a makeover.
It switches from the nominative case (مرفوع) to the accusative case (منصوب).
This usually means the word ends in a double Fatha (-an) and often gains an extra alif at the end.
  • Positive: البيتُ كبيرٌ (The house is big).
  • Negative: ليس البيتُ كبيراً (The house is not big).
Wait, why does it act like a verb? Because it conjugates based on who you're talking about!
If you're talking about yourself, ليس becomes لستُ.
If you're talking about a group of friends on a WhatsApp group, it becomes ليسوا.
It’s a bit like a chameleon that changes color but stays in the same spot.
One cool trick: you can also use the letter بـ (bi) before the predicate for emphasis.
لستُ بكسولٍ (I am NOT lazy at all).
When you use بـ, the ending changes to a Kasra (i sound).
It’s the extra version of negation for when you really want to make a point.

Formation Pattern

1
To use ليس correctly, you need to follow these three steps:
2
Identify the subject. Who are you negating? (I, you, the car, the internet connection?).
3
Conjugate ليس. Match it to the person and number.
4
Adjust the predicate. Change the ending to -an (Accusative) or use the بـ prefix (Genitive).
5
Form | Arabic | Example | Translation
6
--- | --- | --- | ---
7
I | لستُ | لستُ متأكداً | I am not sure
8
You (m) | لستَ | لستَ وحيداً | You are not alone
9
You (f) | لستِ | لستِ جاهزة | You are not ready
10
He/It | ليس | ليس العمل سهلاً | The work is not easy
11
She/It | ليست | ليست المشكلة كبيرة | The problem is not big
12
We | لسنا | لسنا متأخرين | We are not late
13
You (pl) | لستم | لستم في البيت | You (pl) are not at home
14
They (m) | ليسوا | ليسوا مهندسين | They are not engineers
15
Memory Trick: Think of ليس as a pair of sunglasses.
16
When you put them on, the world looks different (the ending changes to -an).
17
If you take them off, the sentence is just a normal, sunny nominal sentence again.

When To Use It

You use ليس whenever you want to negate a state, a characteristic, or a location.
  • Identity: أنا لستُ مدرساً (I am not a teacher). Perfect for when people mistake you for the waiter.
  • Characteristics: القهوة ليست باردة (The coffee is not cold). Essential for complaining at a cafe.
  • Locations: أخي ليس في المكتب (My brother is not in the office). Good for dodging calls.
  • Social Media: هذا ليس عدلاً! (This isn't fair!). Use this when your favorite show gets canceled.
  • Modern Tech: الإنترنت ليس سريعاً اليوم (The internet isn't fast today). The universal B1 struggle.
Don't use it for verbs! You wouldn't say ليس أذهب for "I don't go."
ليس is strictly for nouns and adjectives.
It's like a VIP pass—it only works at the Nominal Sentence club.
If you try to use it at the Verbal Sentence bar, the grammar police will kick you out.
Also, remember it's for the *present* tense.
Even though it looks like a past tense verb, it means is not right now.
If you want to say was not, you’d use لم يكن (but that's a story for another lesson).

Common Mistakes

  1. 1Forgetting the Case Change: This is the #1 mistake.
People say ليس الطالبُ مجتهدُ instead of ليس الطالبُ مجتهداً.
Always remember: ليس makes the second part down (Accusative/Mansub).
  1. 1Confusing لستَ and لستِ: In texting, people often forget the small vowel marks.
لستَ (lasta) is for a guy, لستِ (lasti) is for a girl.
Don't accidentally misgender your friend in the group chat!
  1. 1Using it with Verbs: أنا ليس أحب is a huge red flag.
Say أنا لا أحب instead. ليس needs a noun or adjective to chew on.
  1. 1The Missing Ya Mystery: Notice how the ي (ya) disappears in لستُ, لسنا, etc.?
This happens whenever the conjugation ends in a Sukun (no vowel).
It’s like the ي gets squished and runs away.
Don't try to force it back in; ليستُ sounds like you're trying to speak Arabic with a mouthful of falafel.
  1. 1Gender Agreement: If the subject is feminine, like السيارة (the car), you must use ليست.
السيارة ليس سريعة sounds broken. Match your negation to your subject!

Contrast With Similar Patterns

How do you know when to use ليس versus ما or لا?
  • ليس vs ما: In Modern Standard Arabic (MSA), ليس is the formal, standard way to negate nominal sentences.
ما can also be used (ما هذا بشراً), but it's more poetic or found in dialects.
If you want to sound educated and B1 level, stick with ليس.
  • ليس vs لا: لا is for general negation or verbs.
لا أحد في البيت (No one is at home).
ليس is more specific to the subject-predicate relationship.
  • ليس vs غير: غير is used as a prefix for adjectives, like un- or non-.
غير ممكن (Impossible).
ليس negates the *sentence*, while غير negates the *word*.
Think of ليس as the whole hammer and غير as just a small screwdriver.
One builds a negative statement; the other just tweaks a definition.

Quick FAQ

Q

Does ليس have a future tense?

Nope! It’s frozen in time. For the future, use لن يكون (will not be).

Q

Can I use ليس for "I don't have"?

Not directly. You’d say ليس عندي (There is not with me).

Q

Is it okay to skip the -an ending in casual speech?

In dialects, yes. But if you’re writing an email or taking a test, that -an is your ticket to an A.

Q

Why is the ي gone in some forms?

It's a phonetic thing. Arabic hates having two silent letters in a row.

Q

Is ليس formal?

Yes, it’s very common in MSA and news broadcasts.

Conjugation of Laysa

Pronoun Arabic Transliteration
I
لستُ
Lastu
You (m)
لستَ
Lasta
You (f)
لستِ
Lasti
He
ليسَ
Laysa
She
ليست
Laysat
We
لسنا
Lasna
You (pl)
لستم
Lastum
They
ليسوا
Laysu

Meanings

Laysa is a defective verb used to negate nominal sentences (sentences that describe a state or identity). It functions as the opposite of 'to be' in the present tense.

1

Identity Negation

Negating who or what someone is.

“لستُ طالباً”

“ليسَ هو المعلم”

2

State Negation

Negating a condition or feeling.

“لستُ حزيناً”

“ليست الغرفة باردة”

Reference Table

Reference table for 使用 Laysa (ليس) 否定句子：'不是'
人称代词 变位形式 谓语结尾 中文含义
أنا (我)
لستُ
-اً / -ةً
我不是
أنتَ (你 男)
لستَ
-اً / -ةً
你不是
أنتِ (你 女)
لستِ
-اً / -ةً
你不是
هو (他/它)
ليسَ
-اً / -ةً
他/它不是
هي (她/它)
ليستْ
-اً / -ةً
她/它不是
نحن (我们)
لسنا
-ين / -ات
我们不是
هم (他们)
ليسوا
-ين
他们不是

正式程度

正式
لستُ مستعداً

لستُ مستعداً (Daily life)

中性
لستُ جاهزاً

لستُ جاهزاً (Daily life)

非正式
مش جاهز

مش جاهز (Daily life)

俚语
مو جاهز

مو جاهز (Daily life)

Laysa 否定核心

ليس

否定对象

  • 身份 职业/姓名
  • 状态 心情/天气

语法影响

  • 谓语 变为 -an 结尾
  • 主语 保持 -u 结尾

普通句 vs. 否定句

肯定句 (Mubtada/Khabar)
الجو حارٌ 天气很热
أنا طالبٌ 我是学生
否定句 (使用 Laysa)
ليس الجو حاراً 天气不热
لستُ طالباً 我不是学生

如何选择正确的变位

1

你在说你自己吗？

YES
使用 لستُ (lastu)
NO
下一步
2

主语是阴性单数吗？

YES
使用 ليست (laysat)
NO ↓

Laysa 的常用后缀

👤

单数

  • • لستُ (我)
  • • لستَ (你 男)
  • • لستِ (你 女)
👥

复数

  • • لسنا (我们)
  • • لستم (你们)
  • • ليسوا (他们)
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按水平分级的例句

1

لستُ طالباً

I am not a student

2

ليسَ هو سعيداً

He is not happy

3

ليست الغرفة كبيرة

The room is not big

4

لسنا متعبين

We are not tired

1

لستُ متأكداً من ذلك

I am not sure about that

2

ليس الوقت مناسباً

The time is not appropriate

3

ليست هذه السيارة لي

This car is not mine

4

لستم جاهزين بعد

You (pl) are not ready yet

1

لستُ مهتماً بهذا العرض

I am not interested in this offer

2

ليس من السهل تعلم اللغة

It is not easy to learn the language

3

ليست النتائج مرضية

The results are not satisfactory

4

لسنا مسؤولين عن ذلك

We are not responsible for that

1

ليس ثمة حل آخر

There is no other solution

2

لستُ بصدد مناقشة هذا الأمر

I am not in the process of discussing this matter

3

ليست القضية مجرد مال

The issue is not just money

4

لستم في وضع يسمح لكم بالرفض

You are not in a position to refuse

1

ليس من الحكمة تجاهل هذه الحقائق

It is not wise to ignore these facts

2

لستُ ممن يغيرون آراءهم بسهولة

I am not one of those who change their opinions easily

3

ليست الديمقراطية مجرد تصويت

Democracy is not just voting

4

لسنا في صدد التراجع الآن

We are not in a position to retreat now

1

ليس في مقدور المرء أن يغير الماضي

It is not in one's power to change the past

2

لستُ أزعم أنني خبير

I do not claim to be an expert

3

ليست العبرة في الكم بل في الكيف

The lesson is not in quantity but in quality

4

لسنا بصدد الخوض في التفاصيل

We are not about to delve into details

容易混淆

Negating Sentences with Laysa (ليس) 对比 La vs Laysa

Learners often use them interchangeably.

常见错误

✗

Ana la talib

✓

Lastu taliban

Using 'La' instead of 'Laysa' for nominal sentences.
✗

Laysa ana talib

✓

Lastu taliban

Forgetting to conjugate Laysa.
✗

Laysa al-jawwu baridun

✓

Laysa al-jawwu baridan

Forgetting the accusative case.
✗

Laysa huwa kataba

✓

Ma kataba

Using Laysa with a verb.

句型

Lastu ___.

Real World Usage

Texting very common

Lastu hunak.

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⚠️

消失的字母 Ya

当 ليس 的词尾遇到静符（Sukun）时，中间的字母 'y' 就会消失。比如要说“我不是”，是 «لستُ» 而不是 Laystu！
🎯

用 Bi- 来加强语气

想让你的否定听起来更有力？在描述词前加个 بـ。比如 «لستُ بساحرٍ» 意思是“我绝不是魔术师”。这会让你听起来非常地道！
💬

方言小贴士

在街头聊天时，你会听到人们说 Mish (مش)，但在书本、新闻或正式场合，永远要用 Laysa 才显得专业。

Smart Tips

Use Laysa.

Ana la mudarris → Lastu mudarrisan

发音

LAY-sa

Laysa

The 'ay' is a diphthong like in 'day'.

Falling

Lastu taliban ↓

Standard statement

记住它

记忆技巧

Laysa sounds like 'lies-a'. If someone tells you a lie, you say 'Laysa!' (It is not true!).

视觉联想

Imagine a 'Not' sign (a red circle with a slash) hovering over a person. The person is wearing a shirt that says 'Laysa'.

Rhyme

When you want to say 'it's not', use Laysa on the spot.

Story

Ahmed wanted to be a pilot. He told his friend, 'I am a pilot.' His friend laughed and said, 'Lastu tayyaran!' (I am not a pilot). Ahmed realized he was just a student, so he said, 'Laysa hadha sahihan' (This is not correct).

Word Web

LaysaLastuLaysatLasnaMansoubNominal

挑战

Write 5 sentences about things you are NOT (e.g., I am not a doctor, I am not in London) using Laysa.

文化笔记

In spoken Levantine, 'Laysa' is rarely used. People prefer 'mish' or 'mu'.

Laysa is derived from the root L-Y-S.

对话开场白

“

Hal anta talib?

日记主题

Describe three things you are not.

常见错误

Incorrect

正确

Incorrect

正确

Incorrect

正确

Incorrect

正确

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Test Yourself

在空格处填入 Laysa 的正确形式

✓ Correct! ✗ Not quite. Correct answer:
因为主语是“我” (أنا)，所以 Laysa 要变位成 «لستُ»。
哪个句子在语法上是正确的？

✓ Correct! ✗ Not quite. Correct answer:
ليس 保持主语为原格（u），并使谓语变为宾格（an）。
找出句子中的错误

✓ Correct! ✗ Not quite. Correct answer:
主语是“她” (هي)，所以需要使用阴性形式 «ليست»。

Score: /3

练习题

1 exercises
Fill in the blank.

Ana ___ talib.

✓ Correct! ✗ Not quite. Correct answer: Lastu
Matches 'Ana'.

Score: /1

Practice Bank

6 exercises
重新排列词语，组成一个正确的否定句 Sentence Reorder

متأكداً / لستُ / من / الإجابة

✓ Correct! ✗ Not quite. Correct answer: لستُ متأكداً من الإجابة
使用 Laysa 将句子翻译成阿拉伯语 翻译

咖啡不冷。

✓ Correct! ✗ Not quite. Correct answer: القهوة ليست باردة.
用正确的格位结尾完成句子 填空

ليس الامتحانُ ___.

✓ Correct! ✗ Not quite. Correct answer: صعباً
将代词与正确的 Laysa 形式连线 Match Pairs

连连看：

✓ Correct! ✗ Not quite. Correct answer: Match all correctly
否定这个句子： الطلاب مجتهدون。 多项选择

选择正确的否定形式：

✓ Correct! ✗ Not quite. Correct answer: الطلاب ليسوا مجتهدين.
修正格位错误 Error Correction

لستُ جائعٌ.

✓ Correct! ✗ Not quite. Correct answer: لستُ جائعاً.

Score: /6

常见问题 (1)

No, only with nouns/adjectives.

Scaffolded Practice

1

1

Mastery Progress

Needs Practice

Improving

Strong

Mastered

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In Other Languages

Spanish partial

no ser

Arabic conjugates the negation itself.

French partial

ne pas être

Arabic is synthetic.

German partial

nicht sein

Arabic is a verb.

Japanese low

dewa nai

Arabic is at the start.

Arabic high

Laysa

None.

Chinese low

bù shì

Arabic conjugates.

Learning Path

Prerequisites

Previous
多少？如何使用 Kam (كم)
Next
阿拉伯语中的“有”：表达所属关系 (عندي, لي, معي)

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