 Al-Fārābī holds that “Come here” is neither true nor false, but “You must come here”, which can be used in place of it (yaqūmu maqāma(hu)), is true or false ([Short De Interpretatione] 47.3–48.1). The reason is that the first sentence, unlike the second, has the wrong shape to be true or false. He could be read as saying that every command has the same meaning as some indicative sentence, but truth and falsehood depend on the form of words used, not just on the meaning. But closer inspection shows that he uses the phrase yaqūmu maqāma for some quite weak equivalences where the two sentences in question definitely mean different things. For example, he uses the phrase when a questioner in a debate asks a question with a metathetic affirmation in place of a denial ([Commentary on De Interpretatione] 136.6). His words for different kinds of equivalence (for example, bi-manzila, “in the same role as”, which will be familiar to readers of Classical Arabic linguistics) deserve closer study. Having written [Expressions] and [Letters], he certainly deserves to have his prepositional phrases taken seriously.