افعال کمکی وجهی انگلیسی: can, should, must
can، should و must، توانایی، توصیه و اجبارات مهم رو واضح و مطمئن بیان کن.
Grammar Rule in 30 Seconds
Modal verbs like 'can', 'should', and 'must' change the mood of a sentence without ever changing their own form.
- Never add -s, -ed, or -ing to a modal verb. Example: 'He can swim' NOT 'He cans swim'.
- Always follow a modal with the base verb (no 'to'). Example: 'I must go' NOT 'I must to go'.
- To make a question, just swap the subject and the modal. Example: 'Should I stay?'
مرور کلی
he walks است یا they walk. نگران did و does هستید.-s میگیرند، نه -ed و نه هیچ دردسر دیگری. آنها فقط همانجا مینشینند و به جملات شما «طعم» میدهند. آنها را مثل ایموجی برای افعالتان تصور کنید.I go یک واقعیت است. I can go یک حس و حال است. افعال وجهی افعال خاصی مثل can ، should و must هستند.Can you hear me?در یک تماس زوم یک لحظه کلاسیک برای فعل وجهی است.
Should I post this selfie?یکی دیگر است. آنها در همه جای زندگی مدرن حضور دارند. از زیرنویسهای نتفلیکس گرفته تا چتهای گروهی واتساپ، افعال وجهی کارهای سخت را انجام میدهند.
این گرامر چطور کار میکنه
I can.I eat فقط بیان یک واقعیت است. I might eat به نظر میرسد که هنوز در حال چک کردن منوی Uber Eats هستید. I must eat به نظر میرسد که بعد از یک جلسه طولانی در باشگاه دارید از گرسنگی میمیرید.play یا eat رفتار نمیکنند. آنها شورشی هستند.to قبل از فعل اصلی استفاده نمیکنند. هرگز نگویید I can to swim. این یک زنگ خطر بزرگ برای شنوندگان است.-ing ندارند. شما هرگز musting یا shoulding را در فرهنگ لغت نخواهید دید. آنها ثابت و استوار هستند، مثل آن دوستی که همیشه همان برگر همیشگی را سفارش میدهد.
الگوی ساخت
I ، you ، we یا حتی my cat باشد.
can ، could ، may ، might ، shall ، should ، will ، would یا must انتخاب کنید.
-s ، بدون -ed و بدون -ing.
She can speak English.
-s روی can وجود ندارد، حتی اگر فاعل she باشد.
to قبل از speak وجود ندارد.
not را بعد از فعل وجهی اضافه کنید.
I cannot (can't) go.
You should not (shouldn't) do that.
Can you help me?
do ، does یا did با افعال وجهی استفاده نکنید.
Do you can help?
Can you help?
do ندارند. آنها اینفلوئنسرهای مستقل دنیای گرامر هستند.
کی استفاده کنیم
- از
canبرای توانایی عمومی استفاده کنید.I
cancode. - از
canیاmayبرای اجازه استفاده کنید.CanI use your charger? - از
mustبرای اجبار قوی استفاده کنید.You
mustwear a seatbelt. - از
shouldبرای نصیحت کردن استفاده کنید.You
shouldwatch that new Netflix show. - از
mightیاcouldبرای احتمال استفاده کنید.It
mightrain later. - در پیامکهای مدرن،
canاغلب برای همه چیز استفاده میشود. با این حال، استفاده ازmayیاcouldشما را بسیار حرفهایتر نشان میدهد. تصور کنید به یک استاد ایمیل میزنید.Can I ask a question?خوب است.Could I ask a question?به نظر میرسد واقعاً مطالعه کردهاید. اگر در حال بازی آنلاین هستید، ممکن است برای نصیحت به تیمتان بگویید!We
. اگر در حال ولاگ سفر هستید، ممکن است برای نشان دادن هیجان بگوییدshouldrush B!You
. هر فعل وجهی وظیفه خاصی دارد، مثل شخصیتهای یک بازی RPG.mustvisit this café
اشتباهات رایج
- اضافه کردن
toبعد از فعل وجهی. این اشتباه شماره یک است. هرگز نگوییدI must to study. - اضافه کردن
-sبرای سوم شخص.He cansاشتباه است. همیشهHe canاست. - استفاده از
doدر سوالات.Does he can?باعث میشود مردم با تعجب نگاه کنند. - تلاش برای استفاده از دو فعل وجهی با هم.
I will can goیک اشتباه بزرگ است. به جای آن ازI will be able to goاستفاده کنید. - فراموش کردن اینکه
mustخیلی قوی است. استفاده از آن برای نصیحت میتواند رئیسمآبانه به نظر برسد. - مخلوط کردن
canوcouldدر درخواستهای مودبانه.Couldهمیشه با غریبهها امنتر است. - استفاده از
mustn'tوقتی منظورتان «مجبور نیستم» است.mustn'tیعنی ممنوع است.
مقایسه با الگوهای مشابه
Mustدر مقابلHave to:Mustاغلب درباره احساسات شخصی است.Have toدرباره قوانین خارجی است.Shouldدر مقابلOught to: معنای یکسانی دارند.Shouldفقط خیلی رایجتر است.Canدر مقابلBe able to:Canبرای حال است.Be able toبرای آینده یا گذشته است.Mayدر مقابلMight: احتمالMayکمی بیشتر ازMightاست.
سؤالات رایج
آیا افعال وجهی همیشه ثابت هستند؟ A: بله، آنها هرگز تغییر شکل نمیدهند.
آیا میتوانم از can برای گذشته استفاده کنم؟ A: نه، برای توانایی گذشته از could استفاده کنید.
آیا should قویتر از must است؟ A: نه، must یک دستور است و should فقط یک پیشنهاد.
آیا با ought to به to نیاز دارم؟ A: بله، تنها فعلی است که از to استفاده میکند.
چطور همه آنها را به یاد بسپارم؟ A: آنها را به عنوان تغییردهنده حال و هوا تصور کنید. آنها انرژی جمله را عوض میکنند.
Modal Verb Conjugation (No Change!)
| Subject | Modal | Base Verb | Notes |
|---|---|---|---|
|
I
|
can / should / must
|
work
|
No 'to'
|
|
You
|
can / should / must
|
work
|
Standard form
|
|
He / She / It
|
can / should / must
|
work
|
NO '-s' added
|
|
We
|
can / should / must
|
work
|
Standard form
|
|
They
|
can / should / must
|
work
|
Standard form
|
Common Contractions
| Full Form | Contraction | Usage |
|---|---|---|
|
cannot
|
can't
|
Very common in speech
|
|
should not
|
shouldn't
|
Common for advice
|
|
must not
|
mustn't
|
Used for prohibitions
|
|
shall not
|
shan't
|
Very rare/British
|
Meanings
Modal verbs are a special category of auxiliary verbs used to express ability, possibility, permission, advice, or necessity. They function as 'mood setters' for the main verb that follows them.
Ability & Permission (Can)
Used to express physical or mental ability, or to ask for/give permission in informal settings.
“I can run a marathon in under four hours.”
“Can I borrow your pen for a second?”
Advice & Recommendation (Should)
Used to give suggestions, advice, or to talk about what is ideal or expected.
“You should try the pasta; it's delicious here.”
“We should leave now if we want to catch the train.”
Strong Obligation (Must)
Used to express a firm necessity, a rule, or a personal strong feeling that something is required.
“All passengers must wear a seatbelt.”
“I must remember to call my mother tonight.”
Logical Deduction (Must)
Used when you are almost 100% sure that something is true based on evidence.
“You've been working all day; you must be exhausted.”
“The lights are off; they must be asleep.”
Reference Table
| فعل کمکی | معنی | مثال (مثبت) | مثال (منفی) |
|---|---|---|---|
|
can
|
توانایی / اجازه / امکان
|
I `can` speak French.
|
I `can't` speak French.
|
|
should
|
توصیه / پیشنهاد / انتظار
|
You `should` rest.
|
You `shouldn't` worry.
|
|
must
|
اجبار قوی / ضرورت / نتیجهگیری
|
We `must` leave now.
|
You `must not` smoke here.
|
|
could
|
توانایی گذشته / درخواست مودبانه
|
I `could` sing well then.
|
`Could` you open the door?
|
|
have to
|
اجبار بیرونی / ضرورت
|
I `have to` work late.
|
I `don't have to` go.
|
|
mustn't
|
ممنوعیت
|
You `mustn't` touch that.
|
|
طیف رسمیت
May I please have some water? (Restaurant/Home)
Can I have some water, please? (Restaurant/Home)
Can I get a water? (Restaurant/Home)
Gimme a water, yeah? (Restaurant/Home)
افعال کمکی: Can, Should, Must
Can
- توانایی I can sing.
- اجازه You can leave.
- امکان It can be cold.
Should
- توصیه You should rest.
- پیشنهاد We should go.
- انتظار They should arrive.
Must
- اجبار You must study.
- ضرورت We must hurry.
- نتیجهگیری He must be tired.
'Must Not' در مقابل 'Don't Have To'
انتخاب فعل کمکی مناسب (Can, Should, Must)
آیا در مورد توانایی یا اجازه است؟
آیا توصیه یا پیشنهاده؟
آیا اجبار قوی یا قطعیت منطقیه؟
قدرتهای ویژه فعلهای کمکی
بیان توانایی
- • I can run fast.
- • She can solve this problem.
دادن توصیه
- • You should eat healthy.
- • He should apologize.
بیان اجبار
- • We must follow rules.
- • Students must study.
درخواستهای مودبانه
- • Can you help me?
- • Could you close the door?
مثالها بر اساس سطح
I can play the guitar.
Can you help me?
She can speak English.
We can't come to the party.
You should eat more vegetables.
I must finish my homework.
Should we go to the park?
You mustn't touch that; it's hot!
You should try to arrive ten minutes early.
He must be the new manager; he's wearing a suit.
You don't have to pay now; you can pay later.
Can I suggest a different approach?
The government should have acted much sooner.
There must have been a misunderstanding at the front desk.
You can't have seen Mark; he's in Australia!
Must you make so much noise while I'm working?
One should always consider the ethical implications of such research.
The results can be interpreted in several different ways.
It must be noted that this study has several limitations.
Should you require further assistance, do not hesitate to contact us.
The sheer audacity of the claim must surely give us pause.
One cannot but admire her dedication to the cause.
The policy should, in theory, alleviate the housing crisis.
That he should have failed after such effort is a tragedy.
بهراحتی اشتباه گرفته میشود
Learners often think 'mustn't' is the negative of 'must' in terms of necessity, but it actually changes the meaning to prohibition.
Both are used for permission, but 'can' is informal and 'may' is formal. Teachers often correct 'Can I...?' with 'I don't know, can you?' to emphasize ability.
They mean the same thing, but 'ought to' is much less common and requires 'to'.
اشتباهات رایج
I can to swim.
I can swim.
He cans speak English.
He can speak English.
I no can go.
I can't go.
Do you can help?
Can you help?
You should to rest.
You should rest.
Must you to go?
Must you go?
She shoulds study.
She should study.
You mustn't pay; it's free.
You don't have to pay; it's free.
I musted work yesterday.
I had to work yesterday.
It should be rain tomorrow.
It should rain tomorrow.
I can't help but to wonder.
I can't help but wonder.
He must has forgotten.
He must have forgotten.
Should I'll see him, I'll tell him.
Should I see him, I'll tell him.
الگوهای جملهسازی
I can ___ but I can't ___.
If you are tired, you should ___.
To be a good student, you must ___.
He isn't answering his phone; he must be ___.
You shouldn't have ___ without ___.
Real World Usage
I can work under pressure and I should be able to start next month.
Can u come tonight? You should definitely be there!
Passengers must present their boarding pass.
You should take this medicine twice a day.
You MUST try this new brunch spot! 😍
Can I get the burger without onions?
We should schedule a meeting to discuss the budget.
The battery must be charged for 4 hours before use.
فعل کمکی + فعل اصلی = جادو
You must study hard.
فرق بین 'Mustn't' و 'Don't Have To'
برای مودب بودن از 'Could' استفاده کن
Can I ask a question?، سعی کن بگی
Could I ask a question?– اینجوری نرمتر و محترمانهتر به نظر میرسه، مخصوصاً با همکارای جدید یا استادا. مثلاً:
Could you please help me?
تفاوت 'Must' در انگلیسی بریتانیایی و آمریکایی
You must queue here.در مقابل: (آمریکایی)
You have to wait in line.
افعال کمکی تغییر نمیکنن
He can play the guitar.نه
He cans play.Smart Tips
Stop! Imagine the modal verb is a 'to-eater'. It eats the 'to' before it can reach the main verb.
Use 'might want to' or 'should perhaps' instead of just 'should' to sound more professional.
It's probably a logical guess, not an obligation. 'It must be raining' doesn't mean the rain is following a rule!
Avoid contractions like 'can't' or 'shouldn't'. Use the full forms 'cannot' and 'should not'.
تلفظ
The Silent 'L'
In 'should', the 'l' is completely silent. It sounds like 'shood'.
Can vs. Can't
In American English, 'can' is often reduced to 'kun', while 'can't' has a clear 'a' sound and a sharp 't' (or a glottal stop).
Mustn't
The first 't' in 'mustn't' is silent. It sounds like 'muss-unt'.
Polite Requests
Can you ↗ help me?
Rising intonation at the end makes the request sound more polite.
Strong Advice
You ↘ SHOULD go.
Stress on the modal verb 'should' emphasizes the importance of the advice.
حفظ کنید
روش یادسپاری
Modals are 'Bare' and 'Fixed': they use the Bare infinitive and their form is Fixed (no -s).
تداعی تصویری
Imagine a 'Modal Shield' around the main verb. The shield blocks the 'to' and the 's' from ever touching the verb.
Rhyme
With can, should, and must, the 'to' you must bust; no 's' at the end, they're a learner's best friend.
Story
A king (Must) gives orders, a wise advisor (Should) gives suggestions, and a skilled knight (Can) shows what he is able to do. They all live in a castle where the word 'to' is forbidden.
شبکه واژگان
چالش
Write three sentences about your job or hobby: one thing you CAN do, one thing you SHOULD do better, and one thing you MUST do every day.
نکات فرهنگی
British speakers often use 'should' in places where Americans might use 'would' or 'must', especially to sound more polite or indirect.
Americans rarely use 'mustn't' in casual speech, preferring 'can't' or 'not allowed to'. 'Mustn't' can sound very formal or old-fashioned.
Using 'should' instead of 'must' in a business meeting is a common 'hedging' strategy to avoid sounding too bossy to colleagues.
Modal verbs come from Old English 'pre-present' verbs, which were originally past tense forms that took on a present tense meaning.
شروعکنندههای مکالمه
What is one skill you can do really well?
What should a tourist see in your hometown?
What are some things you must do before you turn 30?
If you could change one law in your country, what should it be?
What must have happened for the world to end up in its current state?
موضوعات نگارش
اشتباهات رایج
Test Yourself
She ___ speak three languages fluently.
Find and fix the mistake:
You shouldn't to worry about the exam.
Choose the correct sentence:
Translate into English: 'No debes usar tu teléfono durante el examen.'
Answer starts with: ["Y...
Score: /4
تمرینهای عملی
8 exercisesYou ___ see the new Batman movie; it's great!
She can ___ (speak) three languages fluently.
Find and fix the mistake:
He musts finish his report by tomorrow.
I should call him. -> ___
1. Can, 2. Should, 3. Must
A: Is that the doorbell? B: Yes, it ___ be the pizza delivery guy.
Select the right one:
The past tense of 'must' is 'musted'.
Score: /8
Practice Bank
11 exercisesThey ___ finish their project by Friday.
He can to swim very well.
Choose the correct sentence:
Translate into English: 'Debes estudiar para el examen.'
Arrange these words into a sentence:
Match the modals with their primary function:
We ___ respect other cultures when traveling.
She must to be tired after that long flight.
Choose the correct sentence:
Translate into English: '¿Puedes ayudarme con mi tarea?'
Arrange these words into a sentence:
Score: /11
سوالات متداول (8)
Yes, in informal situations. For example, `Can I use your phone?` is perfectly fine with friends. In formal settings, use `May I...` instead.
They mean the same thing. `Cannot` is the formal, written version, and `can't` is the everyday spoken version. Note that `cannot` is always one word.
Yes, much stronger. `Should` is a suggestion (you have a choice), while `must` is an obligation (you have no choice).
No. Modals cannot be used together. To express future ability, use `I will be able to`.
This is a common mistake made by native speakers because `should've` sounds like `should of`. It is always grammatically incorrect to write `should of`.
Use it for things that are strictly forbidden, like `You mustn't park here`. It is more common in British English than American English.
Yes! You can say `He should be here soon` if you expect him to arrive based on a schedule.
No. There is no such word as `canning`, `shoulding`, or `musting` in English grammar.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
poder / deber / tener que
Spanish modals are followed by an infinitive (with no 'to' equivalent), but they conjugate fully unlike English modals.
pouvoir / devoir
French uses the conditional tense of 'devoir' (devrais) to express 'should', whereas English has a dedicated word.
können / sollen / müssen
German modals still conjugate for person (ich kann, du kannst), while English ones are fixed.
~reru / ~nakereba naranai
Obligation in Japanese is often expressed as a double negative ('if you don't do it, it won't become').
yumkin / yajib
The 'modal' part doesn't change, but the following verb must conjugate for the subject.
néng (能) / yīnggāi (应该) / bìxū (必须)
Chinese doesn't have the 'no-to' or 'no-s' problem because Chinese verbs never change form anyway.
Learning Path
Prerequisites
Continue With
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