टक

In a sentence

• मैंने अपनी आंटी के घर तक दौड़ लगाई।

  I ran up to my aunt's house.

  Here, "तक" is used as a postposition to denote the extent up to which the action occurred, in this case indicating 'up to the aunt's house.'

• रात के दो बजे तक मैं किताबें पढ़ता रहा।

  I kept reading books until two at night.

  In this instance, "तक" is used temporally to indicate the time span, signifying 'until two o'clock at night.'

• यह खबर देश के हर कोने तक पहुँच चुकी है।

  This news has reached every corner of the country.

  "तक" is employed to emphasize the vast extent of reach in this sentence, marking 'to every corner.'