[
{
"title": "Modal Verbs: Uses of CAN",
"hint": {
"summary": "Possibility vs. Permission vs. Ability",
"content": "The word **CAN** has three main uses:\n\n* **Possibility**: Something is generally possible or true (e.g., *It can be cold here.*)\n* **Ability**: A skill or physical power (e.g., *Birds can fly.*)\n* **Permission**: Asking or allowing someone to do something (e.g., *Can I go?*)"
},
"questions": [
{
"type": "multiple-choice",
"question": "Choose the correct usage: 'It can be very dangerous to drive at night.'",
"options": ["Possibility", "Permission", "Ability"],
"correctIndex": 0,
"explanation": "This describes a general **possibility** or truth, not a specific skill or permission."
},
{
"type": "multiple-choice",
"question": "Choose the correct usage: 'Can I open the window, please?'",
"options": ["Possibility", "Ability", "Permission"],
"correctIndex": 2,
"explanation": "The speaker is asking for **permission** to do something."
},
{
"type": "multiple-choice",
"question": "Choose the correct usage: 'She can speak three languages fluently.'",
"options": ["Permission", "Ability", "Possibility"],
"correctIndex": 1,
"explanation": "This describes a skill or **ability** that she possesses."
},
{
"type": "multiple-choice",
"question": "Which sentence shows **Possibility**?",
"options": ["I can swim fast.", "This puzzle can be tricky.", "You can go home now."],
"correctIndex": 1,
"explanation": "'This puzzle can be tricky' describes a quality the puzzle generally has (**Possibility**)."
},
{
"type": "multiple-choice",
"question": "Which sentence shows **Permission**?",
"options": ["Can I use your pen?", "Cats can see in the dark.", "It can rain a lot in April."],
"correctIndex": 0,
"explanation": "Asking to use a pen is a request for **permission**."
},
{
"type": "multiple-choice",
"question": "Select the correct form: 'Traffic ___ bad in the city center.'",
"options": ["can to be", "can be", "cans be"],
"correctIndex": 1,
"explanation": "After **can**, use the base verb (infinitive without 'to'). Use 'can be' for possibility."
},
{
"type": "multiple-choice",
"question": "Select the correct meaning: 'Anyone can make a mistake.'",
"options": ["It is generally possible for people to make mistakes.", "People have permission to make mistakes.", "People are skilled at making mistakes."],
"correctIndex": 0,
"explanation": "This refers to the general **possibility** that mistakes happen to everyone."
},
{
"type": "multiple-choice",
"question": "Which sentence is grammatically correct?",
"options": ["He can sings well.", "He can to sing well.", "He can sing well."],
"correctIndex": 2,
"explanation": "Never add 's' or 'to' after **can**. Use the base form."
},
{
"type": "multiple-choice",
"question": "Choose the correct usage: 'Can you see the ocean from here?'",
"options": ["Permission", "Ability / Possibility", "Obligation"],
"correctIndex": 1,
"explanation": "This asks about the physical **ability** or **possibility** of seeing the ocean."
},
{
"type": "multiple-choice",
"question": "Choose the correct usage: 'You can park your car here.'",
"options": ["Permission", "Ability", "Possibility"],
"correctIndex": 0,
"explanation": "This is giving someone **permission** to park."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the sentence with one word:",
"question": "Learning a new language ___ be difficult.",
"answer": ["can"],
"explanation": "Use **can** to express general **possibility**."
},
{
"type": "fill-in-the-blank",
"instruction": "Type the modal verb:",
"question": "___ I have a glass of water, please?",
"answer": ["Can", "can"],
"explanation": "Use **Can** to ask for **permission** or make a request."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the sentence:",
"question": "Temperatures in the desert ___ drop quickly at night.",
"answer": ["can"],
"explanation": "Use **can** for things that are theoretically **possible**."
},
{
"type": "fill-in-the-blank",
"instruction": "Fill in the verb:",
"question": "This game can ___ fun for the whole family.",
"answer": ["be"],
"explanation": "After 'can', we use the base verb. In this case, 'be' (e.g., *can be*)."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the sentence:",
"question": "Penguins ___ swim, but they can't fly.",
"answer": ["can", "Can"],
"explanation": "Use **can** to describe an **ability**."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the warning:",
"question": "Smoking ___ cause serious health problems.",
"answer": ["can"],
"explanation": "Use **can** to express a strong **possibility** or risk."
},
{
"type": "fill-in-the-blank",
"instruction": "Fill in the blank:",
"question": "You ___ take photos in this museum. (It is not permitted)",
"answer": ["can't", "cannot"],
"explanation": "We use **can't or cannot** (with not) to deny **permission**."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the sentence:",
"question": "It can ___ a long time to get there by bus. (to take)",
"answer": ["take"],
"explanation": "We use the base verb with no S after can."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the sentence:",
"question": "___ you help me lift this box?",
"answer": ["Can", "can"],
"explanation": "Use **Can** to ask about **ability** or make a request."
},
{
"type": "fill-in-the-blank",
"instruction": "Complete the sentence:",
"question": "Eating out in London ___ be very expensive.",
"answer": ["can"],
"explanation": "Use **can** for general **possibility**."
},
{
"type": "scramble",
"sentence": "It can be cold in winter.",
"explanation": "Subject + can + base verb. This expresses **possibility**."
},
{
"type": "scramble",
"sentence": "Can I open the door?",
"explanation": "Can + Subject + Verb? This is asking for **permission**."
},
{
"type": "scramble",
"sentence": "He can run very fast.",
"explanation": "Subject + can + verb. This expresses **ability**."
},
{
"type": "scramble",
"sentence": "Fast food can be unhealthy.",
"explanation": "Subject + can + base verb. This expresses a general **possibility**."
},
{
"type": "scramble",
"sentence": "You can leave early today.",
"explanation": "Subject + can + verb. This gives **permission**."
},
{
"type": "scramble",
"sentence": "Fireworks can be very loud.",
"explanation": "Subject + can + base verb (be). This expresses **possibility**."
},
{
"type": "scramble",
"sentence": "Can you speak Japanese?",
"explanation": "Can + Subject + Verb? This asks about **ability**."
},
{
"type": "scramble",
"sentence": "Too much sun can burn you.",
"explanation": "Subject + can + verb. This expresses a negative **possibility**."
},
{
"type": "scramble",
"sentence": "Anyone can learn to cook.",
"explanation": "Subject + can + verb. This expresses general **possibility** or potential."
},
{
"type": "scramble",
"sentence": "Can I sit here?",
"explanation": "Can + Subject + Verb? This asks for **permission**."
}
]
}
]
