From the text: “Loyalty cardholders discovered tablet computers listed at ninety-eight percent off the regular price.”

→ Past Simple — completed narrative events

Past Simple requires consistent past forms. 'Order' should be 'ordered' to match 'chose' in the same timeframe.

From the text: “Customers ordered online and chose in-store pickup.”

→ Past Simple — completed narrative events

Past Simple 'ordered' and 'chose' narrate completed sequential events in the past story.

From the text: “The retailer claimed the price was clearly an error.”

→ Past Simple — completed narrative events

Past Simple 'claimed' correctly reports what the retailer said at a specific past moment in the narrative.

From the text: “The answer depends largely on something called recognizability.”

→ Present Simple — stating facts and general truths

Present Simple 'depends' states a general truth about how the legal principle works.

From the text: “This situation raises a fascinating legal question.”

→ Present Simple — stating facts and general truths

Present Simple uses base form, not continuous. 'Is mattering' should be 'matters' for stating facts.

From the text: “The timing matters too.”

→ Present Simple — stating facts and general truths

Present Simple 'matters' expresses a general truth about the importance of timing.

From the text: “Tablets were handed over without any questions.”

→ Passive Voice — focus on affected object

Passive Voice requires 'be + past participle'. 'Were hand' should be 'were handed' (past participle).

From the text: “Many legal systems allow contracts to be voided if an error is both fundamental and recognizable.”

→ Passive Voice — agent unknown or unimportant

Passive infinitive 'be voided' focuses on what happens to contracts, not who voids them.

From the text: “It's listed for just seventeen dollars.”

→ Passive Voice — focus on affected object

Passive 'is listed' focuses on the tablet and its price, not on who created the listing.

From the text: “Therefore, a customer might reasonably think a massive discount is legitimate.”

→ Modal Verbs — expressing possibility

Modal 'might' is followed by base form. 'Might think that it be' should be 'might think it is' (no subjunctive in English).

From the text: “And if you do, can the company take it back later?”

→ Modal Verbs — expressing possibility

Modal 'can' expresses possibility about whether the company has the ability or right to take it back.

From the text: “Twenty years ago, a ninety-eight percent discount would have been obviously wrong.”

→ Modal Verbs — hypothetical past

Modal perfect 'would have been' expresses a hypothetical situation in the past (what would have been true then).

From the text: “However, eleven days later, those same customers received a surprising email.”

→ Contrast Connectors — signaling opposing information

'But' alone (not 'But,') connects contrasts. The comma after 'But' is incorrect; use 'However,' or 'But' without comma.

From the text: “They offered two options: pay most of the original price to keep the tablet (although with a modest discount), or return it.”

→ Contrast Connectors — signaling opposing information

'Although' signals contrast between 'original price' and the unexpected 'modest discount'.

From the text: “Today, however, flash sales and viral marketing have made extreme discounts part of the landscape.”

→ Contrast Connectors — signaling opposing information

'However' signals the contrast between past expectations (obviously wrong) and present reality (common).