How the two verbs "go" and "clean" come in a row?
"Go" is often put before the simple form of a verb (here it's "clean") to add emphasis or create a command. Adding "go" creates a sense of action or urgency in the sentence. This type of sentence is grammatically correct, and the sentence would still be correct without "go". Ex: Go find your sister, dinner is ready! Ex: I need to go help my friend. Also, remember that there isn't a past form. You can never say: He went ask the officials, We went see the movie, etc.
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