" is clearly supplied by the context.
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HifaMoI will underline all foreign words if they are not already underlined.That is much clearer.
HifaMoAll foreign words will be underlined if they are not.For me, this only really works if "are not" refers very clearly back to something in a previous sentence. It is not very good as a way of saying "... if they are not already underlined".
HifaMoAll foreign words will be underlined if they are not already underlined (superfl