 On the other hand, Green 1997 and Green 2000 also observe that even if there can be no force indicator in the sense Davidson criticizes, nothing prevents natural language from containing devices that indicate force conditional upon one’s performing a speech act: such a force indicator would not show whether one is performing a speech act, but, given that one is doing so, it would show which speech act one is performing. For instance, parenthetical expressions such as, ‘as is the case’ can occur in the antecedent of conditionals, as in: ‘If, as is the case, the globe is warming, then Antarctica will melt.’ Use of the parenthetical cannot guarantee that the sentence or any part of it is being asserted, but if the entire sentence is being asserted, then, Green claims, use of the parenthetical guarantees that the speaker is also committed to the content of the antecedent. If this claim is correct, natural language already contains force indicators in this qualified sense. Whether it is worth introducing such force indicators into a logical notation remains an open question.