Hi Vincent. My guess is that only active is correct. What is the passive structure there for?
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Vincent TeoCan I say,
(a) When John poured the warm water into the yeast, it became a mixture. The mixture in the volcanowas erupted/ erupted.
(b) When John poured the warm water in the yeast, the mixture in the volcanowas erupted/ erup
Vincent Teo John mingled/mixed/blended the warm water, yeast and some mixture, put it into the volcano and it [volcano] erupted.