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What is the conditional form used to express a hypothetical situation in the past?

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The conditional form used is 'had + past participle' for the if-clause and 'would have + past participle' for the main clause.

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How do you form a tag question for a positive statement?

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You use a negative tag. For example, 'It's a nice day, isn't it?'

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What is the correct structure for expressing the best aspect of something?

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The structure is 'The best aspect of [noun] is [verb phrase].' For example, 'The best aspect of working in a nursing home is helping people feel more positive about life.'

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How do you form a tag question for a negative statement?

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You use a positive tag. For example, 'You don't like coffee, do you?'

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What is the purpose of using 'to' in a sentence like 'To stay in business, a restaurant needs to have regular customers'?

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'To' indicates purpose or intention.

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What is the difference between 'can' and 'can't' in tag questions?

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'Can' is used for positive statements, while 'can't' is used for negative statements.

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What is the structure of a conditional sentence that refers to an unreal past situation?

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The structure is 'If + past perfect, would have + past participle.' For example, 'If I had known, I would have acted differently.'

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How do you express agreement or confirmation in English?

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You can use tag questions or phrases like 'isn't it?' or 'right?'

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What is the correct form of the verb in the sentence: 'The best aspect of working in a nursing home ___ helping people feel more positive about life.'?

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The correct form is 'is'.

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What is the function of the word 'doesn't' in the sentence: 'Salt usually makes food taste better, doesn't it?'

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'Doesn't' is used to form a tag question that seeks confirmation.