<p>In the thickest parts of the forest, some of the tree branches (hung) so (low) that the hikers (had to) keep (their head) down as they walked. (no error)</p>
<p>The anwser is quite obvious, which is 'their head'--->'their heads'.
But I don't know why not change 'low' to 'lowly'. :(</p>
<p>Hung so lowly? Does that make sense to you? lol</p>
<p>yeh…That’s what I’m asking. Isn’t a verb always following an adverb?</p>
<p>Well I’m saying that “hung so lowly” doesn’t make sense to me when I say it out loud. </p>
<p>Like do you say " I ran so quickly" no, that’s improper because the correct way would be “I ran quickly” or " I ran so quick" it can’t have both “so” and “___ly” together. It just doesn’t make sense that way.</p>
<p>Thanks so much! @Smarty1201</p>
<p>Smarty1201, I think you got it the opposite way. “I ran so quickly” is acceptable, but “I ran so quick” is not. “Ran” is a verb that is modified by the adverb “quickly”. </p>
<p>Serena, there are some verbs like “fast” (or “low”) that can act as adjectives and adverbs. E.g “I run fast”. In your case, “low” is an adverb modifying “hung”.</p>
<p>Ah, I get it! 
</p>
<p>But sometimes there are errors like missing ‘ly’ in the question right?</p>