[lemma=occur] [lemma=when] [tag=□]
[lemma=occur] [lemma=when] [tag=JJ]
One instance of this intrusive mockery occurs when young William is carried off by the Monster , leaving Fritz as a distraught witness . Frost heaving occurs when alternate freezing and thawing of the soil pushes small , shallow-rooted plants out of the ground . This occurs when considerable problems still exist , such as departures from GSA style or difficulties with illustrations . Snowflakes occur when undercooled water falls through the atmosphere , eventually striking another drop of water or piece of dust in the air that causes it to rapidly solidify into a beautiful crystalline snowflake structure .