It means "might". “내일늦을라. 빨리자거라.” means "You might be late tomorrow. You'd better go to bed soon." 을라 is quite an old-fashioned, informal, intimate expression which old people use towards younger people like their children.
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October 9, 2018
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너네 is a very informal, oral expression of 너희들의 which is a plural form of possesive 'your'.
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October 8, 2018
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너넨 = 너네는is a very informal, oral expression of 너희들은which is a plural form of subjective 'you'.