"Must cannot be used to indicate neither logical certainty, nor obligation in the past." For a start that's a double negative: "Not neither A nor B" is wrong, "Is neither A nor B" or "Not either A or B" are both ok. Secondly, it claims that must can't indicate logical certainty (or, can't in the past: the sentence is unclear). Thsi seems false, since : "I picked one of two options, and it wasn't the first. It must have been the second."
So I changed that line.
"(law) Always a directive when used together with apply(application): No one can make you apply for anything." Doesn't say what or who's law, and seems false anyway: "You must apply for a visa before entering the country", "you must apply existing law in this situation" both sound like imperatives to me. I assume by "make" the author meant "punish you if you do not". But in the UK at least a dog, TV, gun etc owner who has failed to apply for a relevant license will be fined. If they have applied for, but do not hold the license, they may not be; therefore it is the act of applying that is a "must".
"(Have two sense: imperative or directive)" Poor grammar. The whole section wasn't terribly clear: munged and expanded.DewiMorgan 13:48, 27 June 2008 (UTC)