• When the verb to be inverted is negative, we put not after the subject.
✓ Had we not attended the meeting, we would have had no idea of the council's plans.
• When the if clause comes before the result clause. we usually separate the two clauses with a comma. When the result clause comes first, we do not use a comma.
✓ If you share a car to work, you can save on energy.
✓ You can save on energy if you share a car to work.
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