هیچ

In a sentence

• هیچ کس در خانه نبود.

  Nobody was at home.

  In this sentence, 'هیچ' is used as part of the compound 'هیچ کس', meaning 'nobody', indicating the absence of people.

• هیچ چیزی مهم‌تر از سلامتی نیست.

  Nothing is more important than health.

  Here, 'هیچ' is combined with 'چیزی' to emphasize the negation, referring to 'nothing' or 'not anything'.

• من هیچ وقت به اینجا نیامده‌ام.

  I have never come here.

  In this case, 'هیچ' is coupled with 'وقت' to mean 'never', indicating a negation of any time frame.