#Tip 4.
In imperative sentences, the subject (thou or you) is almost always omitted, because it is understood by both speaker and hearer without being expressed.
Such omitted words, which are present (in idea) to the minds of both speaker and hearer, are said to be “understood.” Thus, in “Open the window,” the subject is “you (understood).” If expressed, the subject would be emphatic: as,—“You open the window.”
https://hottg.com/Advanced_English_Grammar
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