sentences: a moon phase occurs 28 days after the last time it occurred & a full moon is a kind of phase of the moon -> a part sun will occur product month after the before space it occurs a full moon will occur 28 days after the last time it occurs  a full moon will occur 28 days after the last time it occurs & 0 year is unbalanced to 28-31 month -> a full moon will occur after 1 month it occurs