Competitors offered packs of glue sticks, some of which were broken. Correct<br/><br/> Competitors offered packs of glue sticks, some broken. Correct<br/><br/>Competitors offered packs of glue sticks, some of which contained different sizes. Correct<br/><br/> Competitors offered packs of glue sticks, some contained different sizes. Incorrect<br/><br/> Competitors offered packs of glue sticks, some containing different sizes. Correct<br/><br/><br/><br/>If the above in red has accurately labeled the sentences correct or not, is the below a reasonable assumption?<br/><br/><b>noun + of which + active voice verb</b> can be reduced to <b>noun + active voice ing verb</b><br/><br/><b>noun + of which + passive voice verb</b> can be reduced to <b>noun + passive voice verb</b><br/><br/>Cheers,