From the text: “A tablet is a flat computer you can hold.”

→ Present Simple — defining terms

Present Simple uses 'is' with singular subjects like 'tablet'. 'Are' is incorrect here because the subject is singular.

From the text: “Binding means you must follow it.”

→ Present Simple — defining terms

Present Simple 'means' is used for definitions. We don't use continuous forms (is meaning) when defining terms.

From the text: “Courts are places where judges make legal decisions.”

→ Present Simple — general truths and facts

Present Simple uses 'are' with plural subjects like 'sales'. 'Is' is incorrect because 'flash sales' is plural.

From the text: “Flash sales are very short sales with big discounts.”

→ Present Simple — general truths and facts

Present Simple uses 'are' with plural subjects. 'Flash sales' is plural, so we need 'are'.

From the text: “A refund means you get your money back.”

→ Present Simple — defining terms

Present Simple uses 'means' not 'meaning'. The -ing form cannot be used as the main verb in definitions.

From the text: “The customers ordered the tablets online.”

→ Past Simple — completed narrative events

Past Simple needs the past form 'ordered' not present 'order'. The story happened in the past.

From the text: “They paid the low price.”

→ Past Simple — completed narrative events

Past Simple 'paid' tells what happened in the past. The irregular past form of 'pay' is 'paid'.

From the text: “The retailer said the price was a mistake.”

→ Past Simple — stating what happened

Past Simple uses 'said' not 'says' when telling what happened in the past. Both verbs in the sentence should be past.

From the text: “The customers got another email.”

→ Past Simple — completed narrative events

Past Simple 'got' is the irregular past form of 'get'. It tells what happened in the story sequence.

From the text: “The tablet usually costs one thousand dollars. But the website says seventeen dollars.”

→ But — showing contrast

'But' shows contrast between the usual price and the website price. 'And' adds information, 'so' shows result.

From the text: “Big discounts are normal at Black Friday. So customers thought this was okay.”

→ So — showing result

'But' shows contrast, but here we need 'So' to show result. The normal discounts are the reason customers thought it was okay.

From the text: “pay almost the full original price or return the tablet”

→ Or — presenting alternatives

'Or' presents two alternative choices. 'And' would mean doing both things, which doesn't make sense here.

From the text: “This happens when there is a big mistake.”

→ When — time conditions

'When' introduces the time condition for when something happens. 'Because' would show reason, not time.

From the text: “They did all this before they said there was a problem.”

→ Before — showing sequence

'When' means at the same time, but the meaning needs 'before' to show the orders are cancelled earlier, not at the same time as sending.

From the text: “They want you to come and buy other things too.”

→ Infinitive of Purpose — expressing intention

Infinitive of purpose uses 'to + verb' to show intention or goal. After 'want', we need 'to come' not just 'come'.