that is это

Tто есть

Definition of that is in English Dictionary

Наречие (Adverb)
1. (conjunctive) In other words; that is to say. Used to introduce a clarification or explanation.
Другие примеры
1. Используется в середине предложения
  - If there is one teaching that is peculiar to Buddhism alone among all the world's religions, I would say it is the principle of Śūnyatā (Voidness or Emptiness).
  - Little wonder, then, that the “Martian” novel and now the movie (due Oct. 2) come with the imprimatur of all that is nerdly.
  - I have a hard time tuning out a television that is on.
2. Используется в начале предложения
  - That is right; — keep to your 'magnum opus' — magnoperate away.
  - That is the sluff of a rattler; we must be careful.
  - That is the preponderating consideration to which everything else has to yield.

Часть речи Иерархии (Part-of-Speech Hierarchy)
1. Наречия
  - Конъюнктивные наречия
  - Несравнимое наречия

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Источник: Викисловарь