An imperative is a sentence that tells someone to do something — it gives an instruction, an order, a warning, or friendly advice. It uses the base form of the verb — the 'base form' is the verb in its simplest shape, with nothing added: 'open,' not 'opens' or 'to open.' The word 'you' is not written, but it is always understood: 'Open the door' really means '(You) open the door.' Add 'Don't' for 'do not do it,' 'please' to sound polite, and 'Let's' to suggest something you and I do together.
2. Detailed explanation
Start from zero. English sentences have jobs: A statement tells: 'She opens the door.' A question asks: 'Does she open the door?' This lesson is about a third job: the imperative. An imperative tells someone to do something — an instruction ('Open your book'), an order ('Stop!'), a warning ('Be careful!'), a direction ('Turn left'), an offer ('Have a cookie'), or advice ('Get some rest'). The speaker talks TO another person — 'you.' But in an imperative, 'you' stays hidden: we do not say it, but everybody understands it. 'Sit down' means '(You) sit down.'
The verb in an imperative uses the base form. The base form is the verb in its dictionary shape — the simplest form, with nothing on the end: 'open,' 'sit,' 'listen,' 'be.' It never takes -s (that belongs to he/she sentences like 'She opens'), and it never takes 'to' in front. Let's take two sentences apart word by word. 'Open the door, please': Open (the action, base form) + the door (what to open) + please (the polite word). 'Don't touch that': Don't (do not) + touch (the action, base form) + that (the thing). So a negative imperative is 'Don't + base verb.' Never use 'doesn't' here: 'Don't open it,' not 'Doesn't open it.'
Two small words control the feeling. 'Please' makes it polite, and it can stand at the start or the end: 'Please sit down' or 'Sit down, please' — both are correct and friendly. Without 'please,' a short imperative can sound strong, like an order from a teacher, a police officer, or a parent. The second word is 'let's' (short for 'let us'), and it changes the meaning completely: the speaker joins in. 'Open the window' tells YOU to do it. 'Let's open the window' means you AND I do it together — it is a suggestion, not an order. After 'let's,' use the base form with no 'to': 'Let's go,' 'Let's eat,' never 'Let's to go.'
You will see imperatives everywhere in daily life. Recipes are full of them: 'Mix the eggs. Add the sugar.' Signs use short imperatives: 'Push,' 'Pull,' 'Don't smoke,' 'Keep off the grass.' Directions are imperatives too: 'Go straight, then turn right.' Warnings are strong imperatives, often with an exclamation mark: 'Watch out!' 'Look out!' 'Be careful!' In a classroom you will hear: 'Listen,' 'Repeat after me,' 'Work in pairs.' Even offers sound like imperatives but feel warm: 'Come in!' 'Have a seat.' 'Help yourself.' The meaning depends on the situation and the voice, not only the words.
Remember this first: memorize only these three things. One: an imperative is just the base verb with a hidden 'you' — 'Listen' means '(You) listen.' Two: the negative is always 'Don't + base verb' — 'Don't run,' never 'Doesn't run' as an instruction. Three: 'please' makes it polite, and 'Let's + base verb' turns an order into a suggestion that includes you. With these three points, you can already read signs, follow recipes, and give simple, polite instructions.
3. Formula / structure
positive (instruction / order):
base verb + … → Open the door. / Listen to me. / Be quiet, please. (The subject 'you' is understood, never written.)
negative:
Don't + base verb → Don't run. / Don't be late. / Don't touch that.
polite with please:
Please + base verb … OR base verb …, please → Please sit down. / Sit down, please.
suggestion with let's:
Let's + base verb → Let's go. / Let's have lunch. / Let's not worry. (negative: Let's not + verb)
question:
Imperatives do not form questions. To ask politely, use a normal question: 'Can you open the door, please?' / 'Could you help me?'
Step by step — how to build a sentence:
Positive: 1) Think of the person: 'you' — but do NOT write it. 2) Take the verb in its base form (open). 3) Add the rest of the idea (the window). 4) Add 'please' at the start or end to be polite. Result: 'Open the window, please.' Negative: 1) Start with 'Don't.' 2) Add the base verb (touch). 3) Add the rest. Result: 'Don't touch that.' Question-style request: imperatives cannot ask, so change the order into a polite question: 1) Start with 'Can you.' 2) Base verb. 3) The rest + 'please' + '?'. Result: 'Can you open the window, please?'
4. When to use it
Instructions and steps: 'First, wash your hands. Then, dry them.'
Classroom language: 'Open your books.' / 'Listen and repeat.' / 'Work with a partner.'
Orders and rules: 'Stop!' / 'Wait here.' / 'Don't enter.'
Directions: 'Go straight.' / 'Turn left at the bank.' / 'Take the second street on the right.'
Offers and invitations (friendly): 'Come in!' / 'Have a seat.' / 'Try some cake.'
Suggestions with let's: 'Let's take a break.' / 'Let's call a taxi.'
5. When NOT to use it
Don't add the subject 'you': ✗ 'You open the door' (as an instruction this is a statement or a contrast) → ✓ 'Open the door.' The 'you' is understood.
Don't add -s to the verb: ✗ 'Opens the door!' → ✓ 'Open the door!' The -s form belongs to he/she statements.
Don't use 'to' before the verb: ✗ 'To open the door!' → ✓ 'Open the door!' Also after let's: ✗ 'Let's to go' → ✓ 'Let's go.'
Don't use 'doesn't' in a negative imperative: ✗ 'Doesn't touch it' → ✓ 'Don't touch it.' Negative imperatives always use Don't.
Don't use an imperative where a polite question is needed with strangers or your boss: 'Give me the report' can sound rude — 'Can you send me the report, please?' is safer.
6. Positive examples
Open the window, please.
Sit down and make yourself comfortable.
Listen to the teacher.
Turn right at the next street.
Be careful — the floor is wet.
Take two pills every morning.
Mix the flour and the sugar.
Have a cookie.
Come in! It's cold outside.
Call me when you get home.
Let's go to the beach this weekend.
Please pass the salt.
7. Negative examples
Don't run in the hallway.
Don't be late tomorrow.
Don't touch the paintings.
Don't smoke in this building.
Don't worry — everything is fine.
Let's not give up.
8. Questions
Can you open the door, please? (polite request — a real question form)
Could you say that again, please?
Can you help me with this bag?
Will you be quiet, please? (a stronger, less soft request)
Can we take a break? (asking to do something together — compare 'Let's take a break')
9. Short answers
OK. / Sure. (accepting an instruction or offer)
Of course. Right away.
Sorry, I can't right now. (refusing politely)
No problem. (agreeing to help)
Let's! / Great idea! (answering a let's suggestion)
I won't. (answering 'Don't…': 'Don't be late!' — 'I won't.')
10. Common mistakes
✗ Opens the window!✓ Open the window!Why: an instruction uses the base form of the verb — the simple dictionary shape. The -s ending belongs to statements about he or she, like 'She opens the window.'
✗ You don't touch that! (as a direct order)✓ Don't touch that!Why: in an imperative, the word 'you' stays hidden. The negative is just 'Don't + verb.'
✗ Doesn't open the door✓ Don't open the door.Why: negative instructions always use 'don't,' never 'doesn't' — 'doesn't' is for talking ABOUT he or she.
✗ Let's to dance✓ Let's dance.Why: after 'let's,' the verb comes in its base form with no 'to' in front.
✗ Let's we eat lunch✓ Let's eat lunch.Why: 'let's' already includes 'us' — you and me together — so no extra person word is needed.
✗ Please you help me✓ Please help me / Can you help me, please?Why: 'please' stands with the verb in an imperative; if you want 'you' in the sentence, make it a polite question with 'Can you…?'
✗ Not run!✓ Don't run!Why: English negatives need the helper word — 'not' alone cannot make a negative instruction.
11. American English notes
🇺🇸 American English
In American English, short imperatives are everywhere: road signs ('Stop,' 'Yield,' 'Do Not Enter'), workplace signs ('Wash your hands,' 'Employees only beyond this point' as a notice), and product instructions ('Shake well,' 'Keep refrigerated'). Americans soften orders a lot in daily speech, because a bare imperative to an adult can sound bossy: they add 'please,' use a question ('Can you grab that for me?'), or add a friendly tag ('Close the door behind you, thanks'). Teachers and parents use direct imperatives with children all day: 'Sit down,' 'Eat your vegetables,' 'Don't hit your brother.' 'Let's' is the classic friendly American suggestion: 'Let's grab lunch,' 'Let's get out of here.' And the warm offer 'Have a seat' simply means 'please sit down' — nobody is ordering you to take a chair home.
12. Similar grammar — comparison
Compare
An imperative looks different from a statement and a question. A statement has a subject and tells a fact: 'You open the door at nine' (your habit). A question asks: 'Do you open the door?' The imperative has NO visible subject and tells the listener to act NOW: 'Open the door.' Compare 'can' requests too: 'Open the window' is a direct instruction; 'Can you open the window?' is the polite question form of the same idea, and 'Could you…?' is even softer. Finally, compare 'let's' with 'let me': 'Let's go' = you and I together; 'Let me help you' asks permission for ME to do something — I act alone.
13. Natural spoken English
'Come on, let's go! We're late!'
'Hold on a second.'
'Don't worry about it.'
'Take a look at this.'
'Help yourself — there's more food in the kitchen.'
'Watch out! The coffee is hot.'
14. Real-life examples
On signs: 'Push' / 'Pull' on doors, 'Don't smoke,' 'Keep off the grass,' 'No parking.'
In recipes: 'Preheat the oven. Beat the eggs. Bake for 30 minutes.'
At the airport: 'Show your passport, please.' / 'Take off your shoes.'
GPS directions: 'Turn left in 200 feet.' / 'Continue straight.'
At work: 'Send me the file by Friday.' / 'Let's meet at ten.'
Medicine labels: 'Take with food.' / 'Do not drive after taking this.'
15. Mini dialogue
ACome in! Have a seat, please.
BThanks. Sorry I'm late.
ADon't worry about it. Let's start.
BOK. What do I do first?
AOpen this file and read the first page. Don't print it yet.
BGot it. And then?
AThen call the client. Oh — and please be polite!
BOf course. Let's do it.
16. Summary
An imperative gives an instruction, order, warning, or offer: just the base verb with a hidden 'you.' Negative = Don't + base verb. 'Please' softens it, and 'Let's + base verb' makes a suggestion for us together.
17. Practice exercises
Warm up with the first questions, then take the full quiz — every answer has a detailed explanation (parts 19–20 of this lesson: answer key + explanations live inside the quiz feedback).
18. The full quiz
50 questions, mixed formats, in difficulty order: easy → medium → intermediate → challenging → advanced.