Word: 故 (gù) 故 dictionary entry gù happening; instance; reason; cause; intentional; former; old; friend; and 3 more Full dictionary entry for 故 Example sentences using 故 2 sentences, showing page 1 of 1. 我写，故我在。 Wǒ xiě, gù wǒ zài. I write, therefore I am. 我思故我在。 Wǒ sī gù wǒ zài. I think, therefore I am.