(third-person singular simple present sings up, present participle singing up, simple past sang up, past participle sung up)
"sing-up." YourDictionary, n.d. Web. 18 September 2018. <http://www.yourdictionary.com/sing-up>.
sing-up. (n.d.). Retrieved September 18th, 2018, from http://www.yourdictionary.com/sing-up
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