The indicative is used to make assertions or declarations about situations which the speaker holds to have happened (or, conversely, have not happened), or positions which he maintains to be true. It is also the mood used for questions and other interrogative statements. The perfective, by its very nature, refers to situations that the speaker holds to have happened or not to have happened, and thus pertains to the indicative, apart from explicitly counterfactual conditional clauses, e.g. "agar an láhwit, lá-aṯṯat əl-yanqɔ" ‘if I hadn’t been there, she wouldn’t have brought (=given birth to) the baby.’ The imperfective, on the other hand, is used to describe situations which are ongoing, have yet to happen, or about which there may exist some uncertainty or doubt. When marked by the morpheme "qə"-, it is used to express the indicative, but when it is not thus marked, it expresses the subjunctive. The subjunctive is most commonly used to indicate wishes, possibilities, obligations, and any other statements which may be contrary to present fact. As in the other Semitic languages, the subjunctive must be used in the place of the imperative for all negative commands and prohibitions.