tas

In a sentence

• Tas ir mans telefons.

  That is my phone.

  Here, 'tas' is used as a demonstrative pronoun to indicate a specific item.

• Vai tas ir tavs suns?

  Is that your dog?

  Here, 'tas' functions as a pronoun to point to a specific subject being asked about.

• Es domāju, ka tas ir svarīgi.

  I think that it is important.

  In this case, 'tas' refers to an abstract concept or idea previously mentioned or implied.