أقدر، أعرف، and ينفع

English can covers physical capacity, learned skill, opportunity, feasibility, and permission. Mainstream Cairene makes useful distinctions: أقدر attributes capacity or opportunity to a person, بعرف says that someone knows how to perform a learned skill, and ينفع evaluates whether an action or thing works in the situation and can therefore ask permission.

All three normally introduce a bare person-marked imperfect when the complement is an action. The key question is not “Which word means can?” but “Where does the ability come from: the person, learned know-how, or the situation?”

The full irregular paradigm of قدر / بيقدر is available in the قدر verb reference; here the focus is the choice among three competing ability frames.

A practical decision table

The learned skill remains present, so بعرف is positive. Today's physical limitation blocks performance, so ماقدرش is negative. English uses can for both, hiding the distinction.

أقدر: personal capacity or opportunity

Learn قدر / بيقدر as the ability verb. In modal use, forms such as أقدر، تقدر، نقدر commonly occur directly before a bare action. The first verb agrees with the able person, and the complement agrees with the same understood subject.

Perfect قدرت often means “managed to”: capacity was successfully realized in one bounded situation. That differs from a stable skill.

For a current blocked state, agreeing مش قادر / مش قادرة / مش قادرين is often more immediate than finite ماقدرش. Both are natural, but their viewpoint differs: finite ماقدرش denies ability, while مش قادر profiles the person's present condition.

بعرف: learned know-how

Finite بيعرف can mean “know,” and before a bare action it often means “know how to.” This is the natural frame for learned languages, swimming, cooking, using equipment, or performing a technique. The skill verb carries بـ; the activity complement does not.

Perfect عرفت usually means “found out, came to know, recognized,” according to its complement. Do not use it automatically for “managed to”; that bounded-success meaning belongs naturally to قدرت.

ينفع: feasibility, suitability, and permission

Impersonal ينفع + clause asks whether the circumstances permit an action or whether the proposal is workable. It normally stays third-person masculine singular before a clause, regardless of who performs the lower verb. With a lexical noun as subject, ordinary agreement can appear: الكابل ده ينفع but الوصلة دي تنفع.

Negative ماينفعش can mean “that will not work,” “that is not acceptable,” or contextually “you mustn't.” Its force comes from the rule or situation, not from the addressee's physical capacity.

Bare complements keep their own person marking

After all three frames, the lower action has no بـ, but it still marks its performer. Compare أقدر أروح, تقدري تروحي, نعرف نستخدم, and ينفع تدخلوا. An overt different subject is also possible after impersonal ينفع because it does not control the lower subject in the same way.

Here سارة is the subject of تستلم. By contrast, سارة تقدر تستلم attributes the ability or availability directly to Sara.

Three everyday situations

At work, أقدر negotiates availability. In a lesson, بعرف reports acquired skill. At a building entrance, ينفع asks what the rules permit.

A dialogue about borrowing equipment

The first question checks know-how, the second requests permission, and the final question checks practical ability and availability.

Register and variation

These are mainstream urban Cairene frames (informal/neutral). Formal يستطيع and يجوز occur in official writing, notices, legal discussion, and careful MSA-oriented speech (formal/legal/MSA). ينفع can sound blunt when used as a flat prohibition toward a stranger; a reason or a polite question softens the interaction. Regional, class-, age-, and community-linked varieties may choose different modal verbs or pronunciations (regional/social).

Common Mistakes

Using one can-frame for learned skill and present capacity

Adding بـ to the lower action

Making impersonal ينفع agree with the lower performer

Treating ماينفعش as physical inability

Importing a formal modal into an ordinary chat

Key Takeaways

• Use أقدر for personal capacity or opportunity, بعرف for learned know-how, and ينفع for situational feasibility, suitability, or permission.
• All three take bare action complements, but only ينفع is normally impersonal before a clause.
• Perfect قدرت often means “managed to,” while مش قادر profiles a current limitation.
• ماينفعش evaluates a rule or situation; it is not the default expression of physical inability.