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Using modal verbs to ask for, give or refuse permission and make requests.
English uses modal verbs and related expressions to ask for, give, refuse, and discuss permission, as well as to make requests.
Common forms include can, could, may, might, would, will, and be allowed to.
Can is commonly used to ask for or give permission, especially in informal situations.
For example, Can I use your phone? and You can leave early today.
Could can be used to ask for permission in a more tentative or polite way than can.
For example, Could I borrow your pen? is generally more tentative than Can I borrow your pen?
May is a formal way of asking for or giving permission.
For example, May I come in? and You may begin the examination.
Might can be used in very formal or highly tentative requests for permission.
For example, Might I ask you a question? This use is much more formal than Can I? or Could I?
Be allowed to expresses permission in different tenses and grammatical structures.
For example, We are allowed to park here, We were allowed to leave early, and We will be allowed to enter tomorrow.
Past permission can be expressed with could, was or were allowed to, depending on whether the meaning is general or specific.
Could commonly describes general past permission, while was or were allowed to is often used for a specific past permission.
Could commonly refers to general permission in the past, while was or were allowed to often refers to a specific permission or situation.
Compare When I was a child, I could stay up late on weekends with Yesterday, I was allowed to leave work early.
Use will be allowed to or another appropriate future expression when referring to future permission.
For example, You will be allowed to enter after the inspection.
Can, may, and be allowed to can be used to grant permission.
For example, You can use my computer, You may begin, and Employees are allowed to work remotely.
Permission can be refused using cannot, may not, must not, or not be allowed to, depending on the intended meaning.
For example, You cannot park here, You may not enter this area, and Visitors are not allowed to use this door.
Cannot and must not can both prevent an action, but they express different meanings.
Cannot can express lack of permission or inability, while must not specifically expresses prohibition.
Can is commonly used for everyday requests.
For example, Can you help me? and Can you pass the salt?
Could is commonly used for polite requests and is generally less direct than can.
For example, Could you open the window? and Could you send me the file?
Would is commonly used in polite requests, especially when asking someone to do something.
For example, Would you open the window? and Would you send me the report?
Will can be used to make requests, especially when asking whether someone is willing to do something.
For example, Will you help me with this box? and Will you close the door?
Can you, could you, and would you can all make requests, but they may differ in directness, politeness, and context.
Could you and Would you are often perceived as more polite or less direct than Can you.
Please can be added to modal requests to make the request explicit and often more polite.
For example, Could you please send me the document? and Please can you wait here?
Requests can be made less directly by using introductory expressions and questions.
For example, Could you possibly help me? and Would you mind opening the window?
Would you mind is followed by a gerund when asking someone to do something.
For example, Would you mind closing the door? A response such as No, not at all means that the person does not object.
Can can express either permission or ability, so context determines the intended meaning.
Compare Can you swim? for ability with Can I leave early? for permission.
Can may express permission or general possibility, while may can express possibility as well as permission.
Context distinguishes meanings such as You can leave now and It may rain later.
Different expressions of permission are appropriate in different contexts.
Can is common in everyday conversation, while may and be permitted to are more formal in many contexts.
Formal rules often express permission and prohibition with may, may not, be permitted to, be allowed to, and must not.
For example, Visitors may use the library and Food must not be taken into the laboratory.
Choose the modal or permission expression according to the intended meaning, time reference, and level of politeness.
Common mistakes include confusing permission with ability, using could for a specific past permission when was allowed to is more appropriate, confusing must not with do not have to, and using incorrect patterns after would you mind.