是故

是故	shì gù	therefore / so / consequently
是	shì	to be (followed by substantives only) / correct; right; true / (respectful acknowledgement of a command) very well / (adverb for emphatic assertion)
是	shì	variant of 是
故	gù	happening / instance / reason / cause / intentional / former / old / friend / therefore / hence / (of people) to die, dead