Etymology

thinkest

T1H4I1N1K5E1S1T1
English think ← Middle English thinken ← Old English þenċan
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The story

  1. Proto-Indo-European*teng-
  2. Proto-Germanic*þankijaną
  3. Proto-West Germanic*þankijan
  4. Old Englishþenċan
  5. Middle Englishthinken
  6. Englishthink
  7. English todaythinkest

From think + -est.

Etymology from Wiktionary, CC BY-SA 4.0.