Can & Could Quiz | Beginner Level | 10 Questions & Answers with Explanations

"Could run" correctly uses the past ability modal "could" with the base form "run."

"When he was in college" confirms this is a past ability.

Option A — "could runs" — wrong: -s after modal.

Option C — "could running" — wrong: -ing after modal.

Option D — "could ran" — wrong: past tense after modal.

Rule 1: Modal + V1 (base form).

"Run" is the base form of "run/runs/ran/running" — "could run" is the only correct combination.

"Could not see anything in the dark" expresses an inability in a specific past situation — the darkness prevented seeing.

"Could not" (past ability/inability in context) correctly expresses this.

Note: "can not" would be correct for a present inability.

"Would not" expresses refusal or hypothetical past.

"Shall not" is formal future prohibition.

"Must not" is strict prohibition.

Since the inability is contextual and situational (in the dark), "could not" is the most precise modal — describing an inability under specific conditions.

"Can" expresses general possibility — something that is generally true or possible under certain conditions.

"Hard work can change your destiny" correctly states a general possibility applicable to anyone.

"Must" would express obligation or certainty — too strong.

"Shall" is formal future.

"Could" would suggest a theoretical or uncertain possibility — weaker than the general truth intended here.

The MCQOrbit lesson notes: "Can for general possibility — hard work can change your destiny" — a general truth about what is achievable.

General possibility/truth = "can."

"Can I borrow your pen?" correctly uses "can" for informal permission with the base form "borrow."

Option B inserts "to" — wrong: no "to" after modal.

Option C uses "borrowing" — wrong: -ing after modal.

Option D uses "borrowed" — wrong: past form after modal.

The MCQOrbit lesson confirms: "can" for informal permission.

"Can I...?" is the informal permission structure.

Among the options, A is the only one that correctly follows Modal + V1 (base form) without any addition.

"Could you please...?" is a polite request in the present — "could" makes a request more tentative and polite than "can" or "will."

This is the MCQOrbit lesson's key trap: "Could" in requests works in the PRESENT, not the past.

"Must" expresses obligation — wrong for a request.

"Shall" makes offers — wrong for a request directed at someone else.

"Will" is correct but less polite than "could."

In exam fill-in-the-blank questions, whenever a polite request is signalled by "please," "could" is the most precise answer.

Rule 1 from the MCQOrbit lesson: Modal + base form (V1).

"Can" must be followed by the base form "sing" — not "sings" (third-person singular form).

"She can sing beautifully" is correct.

Adding -s to the main verb after a modal is the most fundamental modal error.

Modals never change form (-s, -ing, -ed) and the verb following them must always be in the base form.

Memory hook: modal = frozen auxiliary — it freezes the verb after it in base form too.

Modal + base form (V1) — never modal + "to" + verb.

"Could you help me with this form?" is correct — "help" is the base form directly after "could."

"Could you to help" incorrectly inserts "to" between the modal and the base verb.

The MCQOrbit lesson's Rule 1 and Common Mistake: "Adding 'to' after modals (other than 'ought to') is always wrong."

Only "ought to" takes "to" — all other modals are directly followed by the base form without "to."

"Can" expresses present ability — the ability someone has right now.

"She can speak three languages fluently" correctly states her current capability.

"Could" would imply she had this ability in the past but may not have it now.

"Would" expresses hypothetical situations or past habits.

"Shall" expresses formal future or offers.

The context ("speaks") has no past signal — the ability is current → "can."

Memory hook: can = current ability; could = past ability.

The time of the ability determines the modal.

 "When he was young" is a clear past time signal — the ability existed in the past, not necessarily now.

"Could" correctly expresses past ability.

"Can" expresses present ability — wrong here because the time signal is past.

"Will" expresses future or willingness.

"Must" expresses obligation or deduction.

The MCQOrbit lesson states: "could = past ability.

He had this ability in the past — he may or may not have it now."

The past time marker always triggers "could" for ability questions.

"Could be a train" expresses theoretical or uncertain possibility — the speaker is not sure what the noise is but suggests a train as one possibility.

"Could" correctly expresses this uncertain, speculative possibility.

"Must be" would express logical deduction based on strong evidence — but here the speaker is speculating, not deducing with certainty.

"Can be" expresses general possibility — too broad for a specific uncertain situation.

"Shall be" is formal future.

The MCQOrbit lesson: "could = theoretical possibility — something possible but not certain."

Uncertain speculation about what something might be = "could."