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Second, we can use it to talk about something in the present which is impossible
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IF, Subject (I, he, she, it, you, we, they), Auxiliary (would, could, might)
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"If + simple past, Subject+ would + verb" or "Subject+ would + verb + if + simple past"
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-->"If I won the lottery, I would buy a house" or "I would buy a house if I won the lottery"
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"If + simple past negative, Subject+ would + not + verb" or "Subject+ would+ not + verb + if + simple past negative"
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-->"If I didn’t win the lottery, I wouldn’t buy a house" or "I wouldn’t buy a house if I didn’t win the lottery"
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-"If + simple past negative, Subject+ would + not + verb" or "Subject+ would+ not + verb + if + simple past negative"
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-->"If you won the lottery, What would you do?" or "What would you do if you won the lottery?"