Related Clues:

• Common thing in a sentence
• Mad Libs specification
• 3-Down's counterpart
• "Walk" or "crawl" or "sink" or "swim"
• Subject of a sentence, typically
• Coffee or tea
• Thing in grammar class
• It may be helping or linking
• Stop, drop or roll
• ''Common'' word
• Person in a sentence, say
• It's often modified
• Mad Libs category
• Proper subject, maybe
• Spit or swallow, e.g