It means that it is impossible to be certain about something.
यह बताना कठिन है
English Usage: You never can tell what might happen in the future.
Hindi Usage: भविष्य में क्या हो सकता है, यह कह नहीं सकते।
kah nahin sakte, keh nahin sakte, kah nahi sakte, keh nahi sakte, keh nahin sakta, kah nahi sakta, kah naheen sakte, keh naheen sakte, kah nahin sakta, keh nahi sakta
